Saturday 26 August 2017

Exponential moving average java code


Cari tahu betapa mudahnya untuk memulai. Maksimalkan pengalaman WebAssign Anda dan pastikan awal yang mulus untuk istilah baru. Dengan WebAssign, Anda mendapatkan alat pengajaran terbaik untuk buku teks kalkulus terkemuka di pasar, dukungan siswa yang superior, dan sumber daya fakultas yang ekstensif. WebAssign bekerja sama dengan Anda untuk membuat lab khusus, atau mengadopsi salah satu laboratorium siap pakai kami. Siswa Baru ke WebAssign Cari tahu betapa mudahnya untuk memulai. WebAssign adalah solusi digital yang kuat yang dirancang oleh pendidik untuk memperkaya pengalaman belajar dan mengajar. WebAssign menyediakan konten yang luas, penilaian instan, dan dukungan yang superior. Di Spotlight Instructor Spotlight: Di dalam Kelas Matematika Lihatlah bagaimana lima pengguna WebAssign yang inovatif meningkatkan kelas matematika. Pelajari tip untuk melibatkan siswa dan memanfaatkan fitur fleksibel WebAssigns secara maksimal. Download Sekarang Sumber Daya Pendidikan Terbuka WebAssign menawarkan beragam pilihan konten akademis STEM yang terjangkau, peer-review, berkualitas tinggi, termasuk bank tutorial dan penilaian. Baca lebih lanjut Mengapa WebAssign WebAssign menempatkan alat yang hebat di tangan instruktur untuk membantu mereka mewujudkan tujuan pengajaran mereka. Tonton video kami untuk melihat bagaimana WebAssign dapat membantu Anda. Tonton Video ContentPatterns, Set-up, Analysis Apa itu Rok Pendek Perdagangan SKIRT SHORT adalah perdagangan kulit kepala cepat yang dibuat sesuai tren jangka pendek. Penyiapan terjadi setelah SampP melakukan gerakan impuls tajam. Pola ini cenderung terlihat seperti bendera kelanjutan pada grafik 1 menit. Kami menyebutnya Rok Pendek karena biasanya perdagangan berlangsung antara 2 - 10 menit. Konsepnya adalah - cepat masuk dan cepat keluar tanpa tertangkap. Kami mencoba mencari setup Short Skirt yang memiliki potensi minimal tiga poin dalam perdagangan. STOP 3 titik awal ditempatkan dari harga masuk perdagangan. Tujuan untuk perdagangan adalah tes ulang ayunan sebelumnya yang tinggi atau rendah, meskipun pasar sering membuat kaki baru naik atau turun. Bagaimana Anda memasukkan Short Skirt Trades Kami melihat retracement harga 2 sampai 4 poin dari ayunan yang paling baru terbentuk tinggi atau rendah. Untuk mata yang tidak terlatih, mungkin berguna untuk melihat rata-rata pergerakan eksponensial 20 periode pada grafik 1 menit, meskipun harga tidak selalu menelusuri sejauh itu. Terkadang reaksi yang masuk ke samping bukan kembali ke EMA bisa menjadi trade terbaik. Retracement harga awal berlangsung sekitar 5 menit. Saat reaksi kembali mulai macet, biasanya kita masuk order pasar. Sangat ideal untuk memasuki perdagangan SEBELUM harga mulai bergerak kembali ke arah tren semula. Hal ini juga paling efisien untuk bekerja dengan tawaran atau tawaran karena harganya sudah benar kembali, namun terkadang jenis pesanan yang digunakan adalah masalah gaya pribadi. Karena harga sudah terkoreksi kembali 2-3 poin saat sebuah perdagangan masuk, jarang sekali stop stop 3 point pertama dipukul. Kami mengencangkan stop setelah perdagangan bergerak menguntungkan kami. Setelah perdagangan mulai bekerja, segera tarik stop Anda ke ayunan terakhir yang tinggi atau rendah jika pasar tidak melakukan uji ulang penuh kembali turun. Apa Bendera BullBear Pola ini diambil langsung dari charting klasik (Schabacker, Edwards amp Magee, dll.) Dan tahan uji waktu. Bendera merupakan pola kelanjutan di pasar yang sedang tren. Mereka ditemukan di semua kerangka waktu, semua pasar, dan menawarkan salah satu rasio penghargaan risiko yang lebih baik untuk pembuatan perdagangan. Pembentukan bendera harus didahului oleh sebuah tiang atau momentum awal bergerak ke arah tren. Konsolidasi berikutnya cenderung relatif dangkal. Pola kelanjutan jauh lebih pendek daripada pola pembalikan. Semakin lama sebuah bendera bergerak ke samping, semakin besar kemungkinan bahwa hal itu akan berubah menjadi pola pembalikan daripada mengarah ke kaki baru ke arah tren. Apa itu Perdagangan Grail Perdagangan Holy Grail awalnya dijelaskan di buku Smart Smart saya. Penyiapan terjadi ketika tren pasar telah cukup kuat sehingga menyebabkan ADX periode-14 naik di atas 30. Bila harga kemudian kembali ke EMA 20 periode, kemungkinannya lebih besar daripada tes ulang yang baru terbentuk tinggi atau rendah. Apa Anti Setup Anti terlihat seperti banteng kecil atau pola bendera beruang yang terjadi baik di tengah rentang perdagangan atau sesaat setelah pasar berbalik dari pergerakan tren yang berkelanjutan. Bendera klasik atau bendera beruang adalah pola kelanjutan yang hanya bisa terjadi di pasar yang memiliki tren yang terdefinisi dengan baik. Kadang-kadang Anti akan terlihat seperti retracement tengah pola A-B-C. Dengan demikian, kita bisa mendapatkan tujuan gerakan terukur yang didasarkan pada ayunan sebelumnya. Anti HARUS didahului dengan langkah IMPULSE jangka pendek. Beli Antis lebih sering terjadi daripada Sell Anti setup. Perdagangan panjang akan memiliki peluang sukses terbaik jika kaki sebelumnya lebih besar dari pada turun kaki sebelumnya. Pengenalan pola osilator berdasarkan osilator 310 atau kombinasi periode 7 K, kombinasi 16-periode D stochastics juga dapat digunakan untuk mengidentifikasi penyiapan ini. Apa Momentum Pinball Momentum Pinball awalnya diperkenalkan di buku Smarts Street sebagai penyiapan untuk menunjukkan Hari Beli atau Hari Jual Pendek ala George Douglas Taylor. Taylor tampak singkat setelah reli 1-2 hari, dan tutup dan pergi lama setelah 1-2 hari mengalami penurunan. Indikator pinball dihitung dengan menggunakan RSI 3-period dari perubahan bersih harian. Buku Smarts Street berisi deskripsi lengkap dan terperinci tentang perdagangan ini. (Momentum Pinball, Anti, Holy Grail, 8020 dan 9010 bar, dan sinyal ROC 2-period adalah beberapa konsep ASLI saya. Berulang kali saya perhatikan bahwa ada orang-orang di internet yang menawarkan buletin dan kursus berdasarkan salinan asli saya. - tuliskan materi yang dilindungi Harap dicatat bahwa saya tidak memiliki afiliasi atau asosiasi dengan entitas ini.) Apa itu Oops Trade Oops adalah sebuah ekspresi yang awalnya diciptakan oleh Larry Williams. Penyiapan terjadi saat celah harga pembukaan berada di luar kisaran hari sebelumnya. Stop beli (atau jual) ditempatkan tepat di dalam kisaran hari sebelumnya jika pasar kemudian menutup celah, mengindikasikan pembalikan. Perdagangan paling baik diperlakukan sebagai perdagangan kulit kepala dan keluar sebelum tutup. Pola ini tidak memiliki nilai peramalan jangka panjang. Apa indikator utama yang Anda gunakan pada grafik Anda Kami menggunakan indikator yang sama di semua pasar, semua kerangka waktu. Kami menggunakan EMA 20 periode (moving average eksponensial), osilator harga, dan ADX periode-14. Osilator yang kita gunakan adalah perbedaan antara rata-rata pergerakan sederhana 3 dan 10, dengan rata-rata pergerakan sederhana 16-periode dari 310. Kami juga menggunakan Saluran Keltner berdasarkan 2.5 ATR yang berpusat di sekitar EMA 20 periode. Perlu diingat bahwa indikator hanyalah sebuah penopang untuk memberi tahu Anda apa yang sudah ada di grafik batang. Banyak pedagang melakukan yang terbaik ketika mereka belajar membaca grafik batang tanpa menggunakan indikator, osilator, dll. Apa itu Mode Breakout Kami menggunakan strategi mode breakout saat pasar memiliki beberapa bentuk kisaran kontraksi. Hari tren, atau rentang ekspansi yang luas, sering mengikuti rentang rentang kontraksi, atau rentang rata-rata harian rata-rata. Saat kita dalam mode breakout, kita menggunakan strategi untuk masuk ke arah pasar yang sedang bergerak, daripada menunggu reaksi harga. Bagaimana Anda mengukur luas pasar, memberi rasio panggilan, dan volume Luas pasar dipantau dengan melihat jumlah masalah yang sedang maju dikurangi jumlah penurunan masalah di NYSE. Data PutCall disediakan oleh pertukaran individu. Kami melihat ekuitas hanya menempatkan rasio panggilan, selain indeks menempatkan rasio volume panggilan. Untuk data putcall yang diperbarui setiap setengah jam, Anda dapat menggunakan tautan ini ke Chicago Board Options Exchange: cboeMktDatadefault. asp Kami melihat volume di NYSE dan membandingkannya dengan pembacaan yang dilakukan pada waktu yang sama pada hari sebelumnya. Kerangka waktu apa yang Anda lihat? Analisis awal malam kami selalu dilakukan dari kerangka waktu harian dan mingguan. Selama hari perdagangan, kami menggunakan grafik 15, 30, 60 dan 120 menit. Untuk SP futures, chart 1 dan 5 menit juga sangat membantu. Paling sering, kita cenderung melihat harga terakhir. Seorang pedagang, yang bisa memantau level support dan resistance dasar dengan melihat aksi rekaman, seringkali akan selangkah lebih maju dari trader menggunakan chart bar. Hal ini juga lebih mudah untuk memantau beberapa pasar dan internal pasar secara bersamaan saat melihat papan kutipan, bukan grafik. Tentukan TICK, TIKI, TRIN, dan VIX. TICK: Ini adalah perubahan bersih dari semua saham NYSE pada kenaikan yang tidak semua saham NYSE mengalami downtick. Plus atau minus 1200 cenderung menjadi pembacaan yang ekstrem. Dalam lingkungan pasar yang sedang tren ekstrem di kutu dapat digunakan sebagai indikator momentum yang mengindikasikan pergerakan harga lebih lanjut untuk datang ke arah tren. Namun saat pasar dalam mode konsolidasi, setelah melakukan pergerakan besar, kutu akan menandai akhir ayunan jangka pendek naik turun. TIKI: Inilah perbedaan antara semua saham DOW dengan uptick dikurangi semua saham DOW pada downtick. Plus 24 atau minus 24 cenderung menjadi pembacaan yang ekstrem. TRIN: TRIN juga dikenal sebagai ARMS Index setelah penciptanya, Dick Arms. Hal ini dihitung sebagai berikut: (Isu Mendepan Isu Mendefinisikan) (Up VolumeDown Volume). Kami melihat arah TRIN bergerak untuk menunjukkan keseluruhan tren pasar. Misalnya, jika TRIN beralih dari 0,80 menjadi 1,00, ini mengindikasikan penjualan akan masuk ke pasar. VIX: Ini adalah Indeks Volatilitas yang didasarkan pada volatilitas tersirat pada uang OEX dan panggilan Sebagian besar umpan data real time mengirimkan indikator ini. Namun, umpan data berbeda mungkin menggunakan simbol yang berbeda. Jika Anda memiliki pertanyaan mengenai kode simbol, hubungi vendor data Anda secara langsung. Hari Z Day A Z adalah hari konsolidasi yang sering mengikuti trend hari. Periode pagi ditandai dengan pengujian bolak-balik dalam aksi harga. Kami menggunakan strategi perdagangan yang berbeda pada hari-hari ini daripada yang kita lakukan pada hari-hari lain. Salah satu perdagangan favorit kami adalah perdagangan bollinger band. Lihat bollinger band explaination di FAQ Apa itu hari NR7 NR7 adalah hari dimana rentang harian harian (harga tinggi hari ini dikurangi harga rendah) lebih sempit dari enam hari sebelumnya. Signifikansi dari pola ini adalah bahwa hal itu merupakan penurunan volatilitas harga yang ditandai. Rentang ekspansi dan kenaikan volatilitas harga cenderung mengikuti hari NR7. Hari NR4 mirip dengan hari NR7 kecuali bahwa itu merupakan hari di mana ragamnya lebih sempit dari tiga hari sebelumnya. Toby Crabel awalnya mempresentasikan konsep NR4, NR7, WR7, dll. Dalam bukunya Market Analytics Letter yang ditulis pada tahun 1980an. Kami memberi pujian kepadanya karena memulai penelitian di bidang ini. Artikel aslinya dimuat di majalah tersebut, Technical Analysis of Stocks and Commodities. Apa itu hari WR7 WR7 adalah hari di mana kisaran harian todays (todays high price minus harga rendah) lebih lebar dari kisaran 6 hari sebelumnya. Signifikansi dari pola ini adalah bahwa hal itu merupakan perluasan dari volatilitas harga. Pedagang sering membeli atau menjual tes WR7 hari tinggi atau rendah, keesokan harinya untuk perdagangan kulit kepala. Berapakah periode 2 periode ROC Periode 2-Rate-of-Change hari ini ditutup dikurangi dua hari yang lalu. Misalnya, untuk mendapatkan ROC 2-periode Fridays, Anda akan mengurangi hari Rabu dekat dari hari Jumat dekat. ROC 2 periode berguna untuk menyoroti siklus perdagangan dua sampai tiga hari seperti yang dijelaskan dalam Taylor Trading Technique. Momentum mentah adalah satu-satunya turunan dari harga yang kami temukan untuk menawarkan hasil statistik yang signifikan dalam penelitian kuantitatif kami. Hasil kami dengan indikator ini terbukti tahan lama dan kuat di semua pasar. Rentang Rata-Rata Rata-rata (ATR) Rata-rata True Range (ATR) diperkenalkan oleh Welles Wilder dalam bukunya, New Concepts in Technical Trading Systems. ATR adalah ukuran volatilitas, dan ini adalah komponen indikator ADX. ATR dihitung dengan menemukan nilai terbesar: 1. Jarak dari todays tinggi sampai todays rendah. 2. Jarak dari kemarin mendekati todays tinggi. 3. Jarak dari kemarin mendekati todays rendah. Perbedaan utama antara ATR dan range harian polos adalah bahwa ATR memperhitungkan kesenjangan akun. Apa perbedaan divergensi terjadi ketika indikator momentum atau instrumen lainnya gagal mengkonfirmasi langkah dalam aksi harga pasar dalam pengamatan. Misalnya, jika SP futures membuat harga rendah baru, namun osilator 310 gagal membuat momentum baru menjadi rendah, maka SP dikatakan berbeda dari osilator. Demikian juga, jika SP futures membuat level rendah baru yang tidak dikonfirmasi oleh level terendah baru di pasar atau indeks terkait (misalnya SP versus Dow Industrials, atau SP versus TICK), ini juga dianggap sebagai bentuk divergensi. Divergensi berguna karena mereka memperingatkan hilangnya momentum dan sering mendahului pembalikan harga. Apa itu Keltner Channels Keltner Channels adalah bentuk dari band perdagangan yang diplotkan langsung di atas grafik harga, berlawanan dengan grafik harga seperti pada kasus osilator atau volume. Band-band tersebut didasarkan pada fungsi ATR yang berpusat di sekitar rata-rata bergerak. Kami menggunakan nilai 2,5 ATR yang ditambahkan dan dikurangkan dari moving average eksponensial 20 periode untuk menciptakan band kami. Apa perbedaan antara Keltner Channels dan Bollinger Bands Bollinger Bands berdasarkan fungsi standar deviasi. Sangat sering, Anda akan melihat saat di mana pasar bergerak TINGGI namun band Bollinger yang lebih rendah mengalami penurunan. Ini tidak terjadi pada saluran Keltner. Meskipun keduanya didasarkan pada fungsi volatilitas, Keltner Channels akan mempertahankan lebar yang lebih konstan daripada Bollinger Bands dan oleh karena itu kami merasa lebih enak dipandang mata. Kami juga memiliki kesuksesan yang jauh lebih baik dalam menggunakan fungsi jangkauan dalam pemodelan kuantitatif kami dibandingkan dengan fungsi standar deviasi, terutama saat menciptakan sistem waktu jangka pendek. Bollinger Band memperdagangkan kami menggunakan 2.5 band deviasi standar yang berpusat di sekitar rata-rata pergerakan 20 periode untuk melakukan perdagangan pada hari setelah hari tren. Kami melakukan perdagangan ini di sesi pagi saja. Konsep di balik ini adalah bahwa dorongan ke band atas atau bawah akan mengatur perdagangan countertrend. Tujuannya adalah mendorong kembali ke moving average. Tidak ada pemberhentian yang digunakan dalam pengujian kami, kami hanya menggunakan jalan keluar kapan pun perdagangan mencapai rata-rata pergerakan atau akhir hari dalam skenario yang lebih buruk. A-B-C adalah istilah yang dipinjam dari terminologi Elliot Wave yang menunjukkan pola koreksi tiga gelombang yang sering ditemukan di tengah tren. Gelombang A, B dan C seringkali sama besarnya dengan harga dan waktu, dan polanya cenderung memiliki tampilan zigzag. Berapakah parameter untuk osilator 310 Untuk membangun osilator ini, pertama kurangi rata-rata pergerakan sederhana 10 periode dari rata-rata pergerakan sederhana 3 periode. Kita sering menyebut ini sebagai jalur cepat. Selanjutnya, buat rata-rata bergerak sederhana selama 16 periode dari jalur cepat - kami mengacu pada baris ini sebagai garis lambat. Hal ini juga berguna untuk merencanakan garis horizontal pada nilai nol. Kami menyusun ketiga garis itu bersama-sama di grafik kami di bawah harga. Untuk beberapa indikator, seperti osilator 310, kami menyediakan file kode TradeStation yang dapat didownload oleh klien. Ketika kita mengacu pada EMA, kita akan selalu mengacu pada moving average eksponensial 20-periode. Baris ini dapat dianggap sebagai proxy untuk regresi ke mean di pasar yang sedang tren. Ini memiliki nilai kecil di pasar perdagangan. Tidak seperti rata-rata bergerak sederhana, yang mengambil harga rata-rata dari periode X terakhir, metode EMA mengambil rata-rata tertimbang dari harga terbaru dan harga rata-rata dari bar sebelumnya. Apa ukuran berhenti yang Anda gunakan Secara umum, kami menggunakan pemberhentian awal 5 poin di SP futures kecuali ditentukan lain. Untuk perdagangan kulit kepala di SPs, kita menggunakan stop point 3 titik. Di pasar berjangka domestik, kita menggunakan fixed 500 perhentian per kontrak kecuali ditentukan lain. Jika terjadi ekspansi volatilitas yang tidak biasa, kita akan menggunakan pemberhentian yang lebih luas dan menurunkan leverage kita. Berhenti harus diperketat saat pasar bergerak sesuai keinginan Anda. Di saham, sebaiknya gunakan pemberhentian untuk membatasi kerugian tidak lebih dari 2 modal kerja Anda. Bagaimana Anda memasukkan posisi Dalam menentukan apakah akan menggunakan pasar, membatasi atau menghentikan stop order untuk menarik kita ke dalam perdagangan, kita menilai kondisi likuiditas dan jenis lingkungan pasar (yaitu tren, berombak, dll.) Setiap pedagang pada akhirnya harus menemukan Gaya SENDIRI yang paling sesuai untuk mereka. Apakah Anda telah menghentikan stop order di pasar Sebagian besar waktu kita menyimpan stop order kita beristirahat di pasar. Pengecualiannya cenderung terjadi saat pembukaan celah diharapkan, dalam hal ini kita membiarkan pasar menetap terlebih dahulu, dan kemudian menempatkan tempat pemberhentian kita tepat di luar jangkauan pagi hari. Pengecualian lainnya adalah ketika kondisi likuiditas saat ini buruk dan kita memiliki posisi yang besar. Ini terjadi di pasar tertentu seperti kopi, di mana lebih baik membiarkan broker mengerjakan perintah keluar dalam jendela waktu tetap. Bagaimana Anda menempatkan pesanan Anda di SP futures Kami memanggil sebagian besar pesanan langsung ke pit berjangka. Namun, selama beberapa tahun terakhir kami telah menggunakan e-minis dengan masuknya pesanan elektronik juga, terutama karena likuiditas telah bergeser ke pasar ini. Apa maksud Anda saat Anda mengacu pada premi Premi nilai wajar adalah harga futures teoritis dikurangi harga indeks kas. Nilai wajar menggambarkan sejauh mana kontrak berjangka harus diperdagangkan di atas atau di bawah indeks tunai mengingat pendapatan dividen yang diharapkan untuk saham dalam indeks, jumlah hari sampai kadaluwarsa untuk kontrak berjangka dan tingkat suku bunga jangka pendek. Ketika SPs melakukan trading dengan harga premium atau diskon, kami mengacu pada situasi di mana futures diperdagangkan di atas atau di bawah nilai wajarnya. Berapakah rasio volatilitas historis Ini adalah rasio antara dua perbedaan volatilitas historis yang berbeda (misalnya, rasio antara volatilitas historis 25 hari dan 100 hari). Kami menggunakan indikator ini untuk mengingatkan kita pada saat volatilitas jangka pendek turun di bawah volatilitas jangka panjang dengan ambang persentase tertentu. Sinyal ini sering merupakan prekursor untuk meningkatkan volatilitas. Apa itu BOBO - pada lembar perdagangan Anda Ini adalah parameter untuk sistem pelarian volatilitas eksklusif yang kita tukar selama periode tertentu. Pembelian dipicu pada break di atas angka atas dan short dipicu pada break di bawah lower number. Apa Golf System Golf adalah sistem kepemilikan yang memasuki SP futures di CLOSE. LBRGroup menerbitkan sistem ini dalam layanan konsultasi antara tahun 1993 dan 1998. Kami juga menukarkannya secara mekanis untuk program berjangka terkelola kami. Kami menghentikan perdagangannya secara mekanis saat volatilitas overnight menjadi terlalu besar selama krisis Asia, meskipun kami masih menggunakannya sebagai indikator waktu. Hal ini didasarkan sebagian pada pola ROC dan diagram batang 2 periode. Apa itu perdagangan 2 poin sore. Pertandingan 2 poin bukanlah pola bagan. Ini adalah sesuatu yang mulai kita lakukan secara real time pada bulan Oktober 2004. Ini juga bukan sistem mekanis, karena tidak ada perhentian tetap lain saat berhenti. Waktu berhenti adalah 24 jam. Ini adalah kecenderungan berdasarkan pengenalan pola (jumlah hari naik atau turun seiring dan tingkat trennya). Ini adalah sesuatu yang mulai kita lakukan untuk diri kita semula, dan anggota lainnya mulai menggunakannya juga. Perdagangan dimulai pada pembukaan kembali kontak Emini setelah pasar tutup (yaitu awal sesi Globex). Sangat sering tujuan 2 titik terpukul dalam sesi Globex, oleh karena itu kami tidak mengerjakan perdagangan ini untuk ruangan ini, tapi hanya memasukkan apa yang mereka inginkan untuk pengetahuan Anda sendiri. Ada kalanya tujuan 2 point tidak tercapai sampai sesi hari keesokan harinya. Tentu akan ada saat dimana tujuannya tidak tercapai sama sekali, juga. Apa itu perdagangan RAT Perdagangan Tikus adalah perdagangan pelarian sore yang kita buat di SPs pada hari-hari dimana ada aktivitas institusional yang berat. Hal ini tidak didasarkan pada formasi grafik tertentu, dan parameter dan filter untuk perdagangan ini bersifat eksklusif. Apa itu perdagangan Call Terakhir Ini adalah perdagangan yang dilakukan pada jam terakhir dalam indeks berjangka. Hal ini mirip dengan Dorong ke dalam kerangka waktu Jam Siang yang kita buat di pagi hari. (Anggota dapat referensi ini di Setup Perpustakaan Perdagangan). Pengaturan Panggilan Terakhir didasarkan pada kombinasi pengenalan pola bar chart dan parameter luas pasar. Apa itu Pivot Point Ini bisa menjadi ayunan sebelumnya yang tinggi atau rendah, atau terlihat seperti titik jenjang tinggi atau rendahnya area gap. Globex tertinggi dan terendah, seiring dengan hari-hari sebelumnya yang tinggi dan rendah adalah semua bentuk Pivot Points. Kami tidak menggunakan angka Fibonacci atau perhitungan sewenang-wenang. Kami tertarik pada tingkat yang diketahui oleh semua pelaku pasar, seperti yang terjadi pada kunci tinggi atau rendah. Apa pola Red Green Red pada grafik batang yang Anda poskan Aturan warna ini didasarkan pada fungsi rentang rata-rata yang sebenarnya ditambahkan atau dikurangi dari ayunan sebelumnya yang tinggi atau rendah. Ini adalah variasi dari parabola stop and reverse formula yang diterbitkan oleh Welles Wilder dalam bukunya, New Concepts in Technical Trading Systems. Kami menemukan bahwa ini memberikan pengenalan pola yang berguna dalam menyoroti ayunan jangka pendek pada diagram batang. General Trading Pertanyaan Terkait Tick Charts vs. Time Interval pada kebanyakan aplikasi perangkat lunak grafik tick 1600 dari sps akan setara dengan grafik 5 menit. Dan grafik tick 3600 sama dengan jangka waktu 15 menit. Kami lebih suka menggunakan jenis tick chart ini di sesi pagi karena mereka menyesuaikan perdagangan globex relatif terhadap tingkat aktivitas. Grafik sesi satu hari pada interval 5 menit bisa terlalu gappy, sedangkan grafik 5 menit secara 24 jam cenderung terdistorsi. Apa kekuatan relatif dan kelemahan relatif yang kita bicarakan di kamar perdagangan online Sederhananya, saham atau sektor yang menunjukkan kekuatan relatif berkinerja lebih baik daripada indeks terkait, seperti SP500 atau Nasdaq. Kelemahan relatif akan menjadi sektor atau saham yang kurang mampu melakukan benchmark index. Dengan komoditas, pemimpin kekuatan relatif adalah yang berkinerja terbaik pada hari itu. Pemimpin kekuatan relatif pagi biasanya terus melakukan yang terbaik sepanjang hari. Apa itu SPY amp QQQ SPY dan QQQ adalah Exchange Traded Funds. Mereka mewakili sekeranjang saham meniru komposisi indeks saham SampP 500 dan Nasdaq100. Mereka bertransaksi di bursa seperti saham individual dan bisa dijual dengan harga turun. Intinya, mereka mengijinkan anda untuk menukar seluruh stock index seperti SP atau Nasdaq futures. Namun, tidak seperti kontrak futures, QQQ dan SPY tidak kedaluwarsa dan bukan instrumen leveraged. Bagaimana Anda melihat begitu banyak pasar Mayoritas waktu, kita melihat papan kutipan yang memberi kita harga terakhir daripada menonton grafik di setiap pasar individual. Dengan cara ini kita dapat memantau berbagai tingkat harga di samping berbagai indeks pasar dan internal pasar. Jika kita ingin melihat grafik pada pasar tertentu, kita menarik sebuah layar yang memiliki kerangka waktu 30, 60 dan 120 menit. SPs dan kadang-kadang obligasi biasanya merupakan satu-satunya pasar di mana kita akan melihat grafik pada kerangka waktu yang lebih pendek. Posisi di sebagian besar pasar lain masuk dengan tujuan membawa posisi menang sepanjang malam. Mengapa Anda melihat begitu banyak saham Saham yang merupakan pemimpin pasar sering bisa berbalik sebelum indeks saham berjangka dilakukan. Hal ini terutama terjadi pada momentum beta beta yang tinggi. Memantau masing-masing sektor dan kekuatan relatif dapat menambahkan informasi berharga mengenai keseluruhan kondisi teknis pasar. Kami membatasi database kami hanya pada 250 saham trading teratas. Broker macam apa yang harus saya gunakan Hindari pialang dengan sistem entri pesanan berbasis browser. Gunakan broker yang menawarkan platform trading terintegrasi (stand alone software) dengan point and click order routing dan eksekusi. Anda harus melakukan penelitian Anda sendiri dalam menentukan perusahaan mana yang akan melakukan bisnis dengannya. Jika Anda tidak senang dengan broker Anda saat ini, sangat mudah untuk mencoba yang lain. Kami mengelola rekening di banyak perusahaan dan merasa penting untuk memiliki banyak hubungan jika ada masalah dengan satu perusahaan atau gangguan geografis di satu bagian negara. Apa data feed dan program perangkat lunak yang Anda gunakan pada umpan Data Real Time: Bagaimana saya bisa melihat apa yang terjadi setiap hari di kamar perdagangan online Untuk LBR Futures Live dan LBR Stock Beat, kami mengirimkan transkrip setiap hari aktivitas di situs kami. Transkrip ini tersedia di bagian Layanan Anggota di situs kami. Untuk LBR Currencies kita tidak mengarsipkan transkrip. Namun ruang Currencies kita akan buka 48 jam, memberi anggota kemampuan untuk dengan mudah mereferensi informasi hari sebelumnya. Saya ingin bergabung dengan layanan anda. Apa yang harus saya ketahui tentang pasar saham Meskipun pengetahuan dan pengalaman sebelumnya tidak benar-benar dibutuhkan, penting bagi Anda untuk memahami bahwa perdagangan melibatkan risiko. Layanan online trading kami bersifat mendidik dan akan bernilai terbaik bagi Anda jika Anda dapat memantau pasar secara real time. Saya masih punya pekerjaan lain. Bisakah saya berdagang paruh waktu ya? Anda memutuskan langkah pembelajaran Anda. Anda mungkin akan memulai paruh waktu dan memutuskan nanti apakah ini bisa menjadi awal karir baru untuk Anda. Ingatlah bahwa waktu dan energi yang Anda masukkan ke dalam pembelajaran akan terbayar di jalan. Namun, kami belum menemukan pedagang yang bisa secara konsisten mendukung diri mereka sendiri dengan melakukan perdagangan paruh waktu. Akhirnya perdagangan adalah pekerjaan penuh waktu, dan banyak orang yang baru mengenal bisnis sering kali terkejut dengan banyaknya trader profesional yang mengabdikan diri untuk mempelajari pasar mereka. Berapa banyak perdagangan yang kita lakukan setiap hari Tidak ada hari normal, dan jumlah perdagangan bervariasi dengan volatilitas kontrak saham dan futures yang kita trading. Namun, kami merasa lebih baik bersabar dan menunggu beberapa dipikirkan dengan baik kemungkinan pembuatan perdagangan probabilitas tinggi, daripada menyelesaikan perdagangan marjinal. Kami menemukan bahwa ketika para pedagang mulai melakukan overtrading, mereka menjadi ceroboh dan membuat kesalahan. Saya tidak bisa berada di dekat komputer sepanjang hari - apakah Anda mempunyai saran lain untuk saya Keanggotaan Online Dasar kami menawarkan set-up dan ide perdagangan yang dapat diterapkan tanpa perlu menonton layar di siang hari. Perdagangan ini termasuk opsi bermain dan perdagangan ayunan saham jangka panjang. Berapa lama waktu yang dibutuhkan untuk belajar berdagang dengan sukses Dalam pengalaman kami, rata-rata lama waktu yang dibutuhkan seseorang untuk dapat berdagang dengan konsistensi dan kepercayaan diri yang diperlukan untuk menghasilkan kehidupan yang layak adalah sekitar tiga tahun. Beberapa orang tidak pernah bisa melakukan ini, karena mereka tidak dapat menguasai sisi mental permainan. Beberapa orang telah dapat menemukan ceruk mereka dengan cepat dan menunjukkan profitabilitas yang konsisten setelah hanya 6 bulan. Ini adalah pengecualian sekalipun. Apa hal yang paling penting yang harus dilakukan oleh seorang trader hari Apa metode yang tersedia untuk mengakses chat room Kami menawarkan kepada semua anggota dua metode untuk mengakses obrolan langsung kami: 1. Metode perangkat lunak yang berdiri sendiri 2. Metode berbasis browser Kedua metode tersebut menawarkan hal yang sama. Kecepatan konektivitas dan memberikan informasi yang sama. Kami menemukan bahwa kebanyakan orang lebih memilih metode perangkat lunak yang berdiri sendiri untuk fitur-fiturnya, seperti mode tampilan jendela multi-mode. Setelah Anda login (klik tombol Futures Live, Stock Beat atau Currencies yang terletak di sisi kiri atas halaman rumah kami), Anda akan sampai pada halaman dengan informasi lengkap untuk mengakses kedua metode, termasuk petunjuk untuk mendownload perangkat lunak obrolan kami yang berdiri sendiri. Catatan: sistem live chat kita tidak akan mengizinkan menjalankan kedua metode secara simultan. Anda juga tidak bisa menjalankan sistem obrolan kami di dua komputer terpisah, secara bersamaan. Apa fitur video itu semua, dan bagaimana cara mengaksesnya Begining pada bulan Juni 2006, kami mengupgrade perangkat lunak chat kami yang berdiri sendiri untuk memasukkan umpan video langsung ke komputer Lindas. Semua anggota Futures Live dan Stock Beat akan memiliki akses ke fitur ini tanpa biaya tambahan. Fitur ini memungkinkan Anda melihat diagram dan indikator aktual yang Linda dan stafnya gunakan saat mereka mengatur perdagangan dan melakukan panggilan di chat room. Untuk informasi tentang fitur ini, klik di sini. Apakah saya memerlukan versi terbaru dari perangkat lunak obrolan Anda untuk mengakses fitur video Di mana saya mendownload versi terbaru dari perangkat lunak obrolan Anda Versi terbaru tersedia dengan mengklik tombol Futures Live atau Stock Beat yang terletak di sisi kiri atas kami. Halaman rumah Setelah memasukkan username dan password anda, anda akan diberi kesempatan mendownload file program. Dapatkah Anda menunjukkan kepada saya secara lebih rinci bagaimana masuk ke sistem obrolan berbasis browser Untuk petunjuk lengkap, klik di sini. Bagaimana cara mendapatkan link web (alias hyperlink) untuk bekerja di jendela obrolan saya klik pada mereka, tapi tidak ada yang terjadi. Saat Anda meletakkan mouse di atas tautan di chat room, tautan tidak akan mengubah tampilannya seperti biasanya Anda lihat di laman web standar. Jangan khawatir, ini normal. Anda perlu menempatkan mouse Anda langsung di atas link, dan kemudian klik dua kali. Browser Internet Explorer Anda kemudian harus terbuka. JUGA - link harus semua pada satu baris di jendela obrolan. Jika link dipecah menjadi dua baris, maka cukup ukuran ulang jendela Anda agar tautan kembali ke satu baris teks. Saya tidak bisa mendapatkan software obrolan untuk bekerja. Jika Anda menggunakan perangkat pemblokir pop-up atau firewall di komputer Anda, ini mungkin akan berdampak buruk dan bahkan mungkin mencegah agar perangkat lunak obrolan tidak berfungsi. Periksa untuk memastikan Anda menginstal Java Runtime Environment (JRE) terbaru. Versi terbaru bisa ditemukan disini. Perhatikan persyaratan minimum sistem kami: - Sambungan Internet Kecepatan Tinggi (modem DSL atau Kabel) yang disarankan - Win98, NT, 2000, XP - Browser Internet berbasis Java (mungkin memerlukan Microsoft Java Virtual Machine untuk diperbarui atau diinstal atau Java Environment Ming Runtime : Java. sungetjava) CATATAN untuk Administrator Sistem: Aplikasi live chat kami dirancang untuk menggunakan koneksi Internet langsung. Jika Anda menggunakan NAT dan sebuah sistem firewall, Anda harus mengizinkan koneksi keluar ke port 8523 dari server kami (lbrgroup). Pemetaan port juga bisa digunakan di gateway Internet Anda. Ruang Open Forum apa yang digunakan untuk ruang Open Forum adalah kamar khusus hanya untuk anggota untuk berbicara di antara mereka sendiri. Kamar ini akan memiliki bidang teks kosong di bawah jendela, di mana Anda dapat memasukkan komentar Anda. Setelah mengetik, untuk mengirim komentar ke ruangan, cukup tekan tombol Return atau Enter pada keyboard Anda. Bagaimana cara mengirim pesan pribadi Anda dapat mengirim pesan pribadi ke anggota lain dan juga moderator ruang. Cukup letakkan mouse Anda di atas nama orang yang ingin Anda kirimi pesan, dan klik kanan. Kemudian pilih Private Session. Ini akan membuka jendela baru bagi Anda untuk mengirim dan menerima pesan pribadi Anda. Setelah mengetik pesan Anda di kolom teks yang terletak di bagian bawah jendela obrolan, tekan tombol kembali keyboard Anda untuk mengirim pesan. Perhatikan bahwa daftar nama anggota dan nama moderator hanya akan muncul di ruang Forum Terbuka, di sisi kanan. Bagaimana cara menyesuaikan ukuran font Baik yang berdiri sendiri maupun metode obrolan berbasis browser memungkinkan Anda menyesuaikan ukuran font Anda. Cukup letakkan mouse Anda di atas area teks di dalam jendela transkrip, lalu klik kanan mouse Anda. Anda kemudian dapat memilih ukuran font khusus dari daftar. Apa penyesuaian yang dikendalikan pengguna lain yang dapat saya lakukan pada perangkat lunak yang berdiri sendiri Dalam perangkat lunak yang berdiri sendiri, letakkan mouse Anda di atas ikon biru kecil yang terletak di sudut kiri atas jendela obrolan. Selanjutnya, pilih salah satu dari kontrol berikut: - Multi Window mode. Perubahan dari single window mode ke multi-window mode. - Selalu di atas . Membuat perangkat lunak tidak dikaburkan oleh aplikasi perangkat lunak lain yang berjalan di komputer Anda. - Putar Suara Nyalakan dan matikan semua suara audio ruangan. - Mainkan EMA. Nyalakan dan matikan suara pengetikan halus saat pesan disiarkan ke ruang utama. How do I enable the copy, cut and paste functions in the chat applications This requires adjusting the security settings on your web browser (Internet Explorer). Please click here to access a PDF file with detailed instructions for changing these settings. File requires Adobe Acrobat viewer. General Website Questions How can I cancel or change my service In the Member Services area of our web page, you will find links to Modify my Profile . How do I ask questions Sending us an email is the easiest way. Please see the Contact Us area of our web site. How do I print text found on your web site pages To print the class transcripts, guest lectures or other text items (without also printing all the formatted headers and other content on the page) heres what you do: 1. Simply select the text with your mouse (i. e. highlight the area you want to print). 2. Right click your mouse and select copy. 3. Open up Microsoft Notepad (look under Start--gtPrograms--gtAccessories--gtNotepad) and then simply paste in the text (right click mouse and select paste). 4. Voila -- you are ready to print the text (make sure youre printer is turned on) 5. For charts simply place your mouse on top of the chart - then right click - and save as to your hard-drive. Go to the saved file, click on the file to open it, and proceed to print. How do I print Charts 1. Right click your mouse on top of the chart you want to save, and select Save Picture As. 2. Save the chart image file to your harddrive. 3. Open chart image file by double clicking on file, then select Print from the Edit menu of you software. Why do charts print with such a dark background color Virtually all charts on this site are created with Aspen Graphics software. We realize that they do not print well with a dark background. We apologize for the inconvenience. The trade off is that we are able to manipulate the color rules and write our own formulas to show you unique and useful trading patterns. Why does it say no gaps on some of your charts in the Daily Educational Charts These charts are generated by Aspen Graphics. No gaps means that the data is compressed to eliminate holidays where the markets are closed. If this function is not turned on, a gap will appear in the data for the holiday session. ADX . Trend strength oscillator originally developed J. Welles Wilder Jr. that fluctuates between 0 and 100. BEAMER . Nickname for IBM BEAR FLAG . Classic bar chart pattern that occurs in a trending market, a bearish continuation pattern. BEAR TRAP . A bear trap occurs when the market breaks below chart support, bringing traders in on the short side, then quickly reverses, trapping traders with losses. BREADTH . The difference between the number of advancing issues and the number of declining issues on the NYSE. BREAKOUT TRADE . A trade that occurs when the market breaks above or below some pre-define range, usually a nearby support or resistance levels such as the previous days high or low, or the last 60 minutes highlow. Breakouts are often associated with low volatility readings. BULL FLAG . Classic bar chart pattern that occurs in a trending market, a bullish continuation pattern. BULL TRAP . A bull trap occurs when the market breaks above chart resistance, bringing traders in on the long side, then quickly reverses, trapping traders with losses. BURNING DOG . This is the phrase used to describe the tendency for the SPs to retrace back into a gap area by N - amount after a gap of N-amount. Though we make trades off this pattern in the futures room in the morning after a gap on certain days, this phrase describes a tendency only, and is not a mechanical trade setup. COMPRESSION METER . LBRGroups proprietary volatility index used to signal potential for longer term breakouts. COWS . Nickname for the Live Cattle futures CREEPER MARKET . A market that slowly creeps higher without a significant retracement. One of the strongest types of trending action that does not catch peoples attention. DISCOUNT (SPs) . When the price of the future is trading lower than fair Value DIVERGENCE . A divergence is indicated when momentum fails to confirm a new low or new high in the price. Divergences usually show up best with oscillators such as the 310 and 535 MACD. EDGE . Term used to describe when a trader has the advantage or a favorable margin. It is even better when this margin can be quantified statistically. EMA . Moving Average Eksponensial. We use a 20-period setting EQUILIBRIUM LEVEL . The point at which buyers and sellers are in balance. Coincides with a neutral chart point that is often at the end of a consolidation period. EVENT RISK . The risk that some unexpected event will cause a substantial change in the market value of a security. For example, missed earnings, lawsuits, crop failures, war, etc. FADE . A countertrend trade FAIR VALUE . Fair value reflects the relationship between stock index futures and the indexs current levels. It is a theoretical estimate of where the futures should be trading based on their underlying cash index with short-term interest rates and dividends factored into the calculation. Determining the fair value relationship between the SampP 500 futures contract and the underlying SampP 500 index requires adding the cost of borrowing the money to buy the SampP 500 stocks, while subtracting the gain these stocks pay in dividends. FILL OR KILL . This means do it now if the stock is available in the crowd or from the specialist, otherwise kill the order altogether. GOLF . A mechanical trade that is made in the SP futures that is entered on the close of the day. GRAIL . A trade set-up based on a pullback to the 20 period EMA after the 14 period ADX has risen above 30. Pullback in rallies are bought, and pullbacks in declines are sold short. This pattern was discussed at lenght in Street Smarts. IMPULSE . Increase in the market momentum. Impulse moves tend to happen in the direction of the trend. On a bar chart they have the appearance of a sharp markup or markdown. INSTITUTIONS . Mutual funds, pension funds, banks, and large commercials KELTNER CHANNELS . A trading band indicator that is displayed on top of price charts. Similar to Bollinger Bands but calculated differently, using true-range rather than standard deviation. LAST CALL . Trade that setups up in the last hour of a trend day LOAD THE BOAT . Use full line of leverage MACD . An oscillator based on the difference between two moving averages. We use the difference between a 3 and 10-period simple moving average MARK UP . A Wyckoff term, used to denote the phase of the market where prices rise, from the beginning of a bull market to its top. MARKET LEADERSHIP . Market leadership refers to those sectors and industries that are currently bringing in the best returns. MARKET ORDER . An order to buy or sell a stock immediately at the best available current price. A market order guarantees execution. MIT . Market-if-touched order. An order which becomes a market order if the specified price is reached. MOC . Market-on-close order. A buy or sell order which is to be executed as a market order as close as possible to the end of the day. MOMENTUM . The difference between the last price and the price N-numbers bar. A 2-period Rate of Change (ROC) is the same as a 2-period Momentum. NAZDOG . Nickname for the Nasdaq100 index. NAZDOGGIE . Name of Linda8217s adorable little Pomeranian. See photo gallery . NR7 . The narrowest high-low range of the past seven days. OODA . The OODA Loop, often called Boyd8217s Cycle, is a creation of Col. John Boyd, USAF (Ret.). Col. Boyd was a student of tactical operations and observed a similarity in many battles and campaigns. He noted that in many of the engagements, one side presented the other with a series of unexpected and threatening situations with which they had not been able to keep pace. The slower side was eventually defeated. What Col. Boyd observed was the fact that conflicts are time competitive. According to Boyd8217s theory, conflict can be seen as a series of time-competitive, Observation-Orientation-Decision-Action (OODA) cycles. OOPS TRADE . A term originally coined by Larry Williams which refers to a market that gaps below the previous days low (or above the previous days high) and then quickly reverses its direction. OOZE . Down trending price action that slowly inches down without any upward reactions of any magnitude. One of the strongest forms of trending action. OPENING BULGE . Period after the opening when the public has a tendency to pay too high a price. OPENING PLAY . The markets first tendency of the day OUCH SETUPS . When a market Closes in the upper 75 of its range but then gaps lower the next day around the previous days low (vice versa to the upside). OVERHEAD SUPPLY . Are where the market had found support in the past but the price is currently trading lower. PEA SHOOTER DAY . Our SP brokers affectionate term for when the institutions are absent and the majority of the paper in the SP pit consists of 1s and 2s. PIVOT . A market reference point. Our most frequently used pivots are swing highs and swing lows such as the high and low of a daily bar or the highs and lows of the hourly cycles. POWER BUYSELL . A retracement formation that combines two time frames. For a chart example of this setup, members can reference the trade library setup. PREMIUM (SPs) . When the price of an index future is trading greater than Fair Value. PUSH INTO THE NOON HOUR TIMEFRAME . Trade that setup around 11:00 EST on a trend day RAT TRADE . An afternoon breakout trade that is made in the LBRFutures Room RESISTANCE . Area where Sellers have come in the past. ROBUST . Refers to a method or system that is profitable across a variety of markets, time frames and parameters. It is the opposite curve-fit or optimized. SCALP . A Short-term trade that capitalizes on the markets smaller fluctuations. SHAKEOUT FAKEOUT . A sharp downward move following an area of distribution that quickly reverses itself and comes back up through the distribution area. SHORT SKIRT . The name of a very short term pattern trade taken on a one-minute SampP and Nasdaq futures charts. A form of pullback trade on a very short time frame. SKIDS . Slippage or the difference between the price that a stop order was placed and the actual fill price. SLOP AND CHOP . Action in the market when institutions are absent and liquidity is poor. SMA . Simple Moving Average SPRING . Originally a Wyckoff term, is used to denote an impulsive move often associated with a test of support. See also Upthrust. STOP ORDER . An order that becomes a market order when the price touches that level. SUMTICK . LBRGroups proprietary summation Tick index SUPPORT . Area where buyers have stepped in the past. SWEET STUFF . Nickname for the sugar futures THREE PUSHES . A characteristic pattern that occurs near important turning points. Usually three distinct test of a high or low level, followed by a reversal. 3 OCLOCK JIGGLE . A scalp trade that sets up in the SPs around the time that the bonds close. TICK . Smallest increment that a price can change. 1 tick on an e-mini contract .25 points, which is the equivalent of 12.50. TICKS . The difference between the number of issues on the NYSE that are trading UP from the last trade versus the number of issues that are trading down. TREND DAY . A day where the market opens on one end of its range, closes on the opposite end, shows range expansion and has an increase in volume. TRIGGER . Level at which a trade will be initiated if a market trades to that price. TRIN . The TRIN (also know as the Trading Index and the ARMS Index) was invented by Richard Arms in the 1970s. It is calculated as follows: (Advancing issues Declining issues) divided by (Advancing volume Declining volume). If the index is above one, the average volume of stocks that fell on the NYSE was greater than the average volume of stocks that rose. If the index is below one, then the converse is true. UPTHRUST . Originally a Wyckoff term, is used to denote an impulsive move often associated with a test of resistance. See also Spring. VIX . VIX is a weighted measure of the implied volatility for 8 OEX put and call options. VIX represents the implied volatility for this hypothetical at-the-money OEX option. VOLATILITY . The range of the price action over N - Number of bars. WEDGE . A low volatility point in which a triangle type formation can be drawn on the bar charts. The market can break out in EITHER direction from this formation. WHIPSAW . Is when the market rapidly reverses its direction several times in succession. WIRE . Nickname for the Copper Market Z DAY . A consolidation day that typically follows a trend day.1.5 Input and Output In this section we extend the set of simple abstractions (command-line input and standard output) that we have been using as the interface between our Java programs and the outside world to include standard input . standard drawing . and standard audio . Standard input makes it convenient for us to write programs that process arbitrary amounts of input and to interact with our programs standard draw makes it possible for us to work with graphics and standard audio adds sound. Birds-eye view. A Java program takes input values from the command line and prints a string of characters as output. By default, both command-line arguments and standard output are associated with an application that takes commands, which we refer to as the terminal window . Here are some instructions for using the command line on your system. Mac middot Windows middot Linux Command-line arguments. All of our classes have a main() method that takes a String array args as argument. That array is the sequence of command-line arguments that we type. If we intend for an argument to be a number, we must use a method such as Integer. parseInt() to convert it from String to the appropriate type. Standard output. To print output values in our programs, we have been using System. out. println() . Java sends the results to an abstract stream of characters known as standard output . By default, the operating system connects standard output to the terminal window. All of the output in our programs so far has been appearing in the terminal window. RandomSeq. java uses this model: It takes a command-line argument n and prints to standard output a sequence of n random numbers between 0 and 1. To complete our programming model, we add the following libraries: Standard input. Read numbers and strings from the user. Standard drawing. Plot graphics. Standard audio. Create sound. Standard output. Javas System. out. print() and System. out. println() methods implement the basic standard output abstraction that we need. Nevertheless, to treat standard input and standard output in a uniform manner (and to provide a few technical improvements), we use similar methods that are defined in our StdOut library: Javas print() and println() methods are the ones that you have been using. The printf() method gives us more control over the appearance of the output. Formatted printing basics. In its simplest form, printf() takes two arguments. The first argument is called the format string . It contains a conversion specification that describes how the second argument is to be converted to a string for output. Format strings begin with and end with a one-letter conversion code . The following table summarizes the most frequently used codes: Format string. The format string can contain characters in addition to those for the conversion specification. The conversion specification is replaced by the argument value (converted to a string as specified) and all remaining characters are passed through to the output. Multiple arguments. The printf() function can take more than two arguments. In this case, the format string will have an additional conversion specification for each additional argument. Here is more documentation on printf format string syntax. Standard input. Our StdIn library takes data from a standard input stream that contains a sequence of values separated by whitespace. Each value is a string or a value from one of Javas primitive types. One of the key features of the standard input stream is that your program consumes values when it reads them. Once your program has read a value, it cannot back up and read it again. The library is defined by the following API: We now consider several examples in detail. Typing input. When you use the java command to invoke a Java program from the command line, you actually are doing three things: (1) issuing a command to start executing your program, (2) specifying the values of the command-line arguments, and (3) beginning to define the standard input stream. The string of characters that you type in the terminal window after the command line is the standard input stream. For example, AddInts. java takes a command-line argument n . then reads n numbers from standard input and adds them, and prints the result to standard output: Input format. If you type abc or 12.2 or true when StdIn. readInt() is expecting an int . then it will respond with an InputMismatchException . StdIn treats strings of consecutive whitespace characters as identical to one space and allows you to delimit your numbers with such strings. Interactive user input. TwentyQuestions. java is a simple example of a program that interacts with its user. The program generates a random integer and then gives clues to a user trying to guess the number. The fundamental difference between this program and others that we have written is that the user has the ability to change the control flow while the program is executing. Processing an arbitrary-size input stream. Typically, input streams are finite: your program marches through the input stream, consuming values until the stream is empty. But there is no restriction of the size of the input stream. Average. java reads in a sequence of real numbers from standard input and prints their average. Redirection and piping. For many applications, typing input data as a standard input stream from the terminal window is untenable because doing so limits our programs processing power by the amount of data that we can type. Similarly, we often want to save the information printed on the standard output stream for later use. We can use operating system mechanisms to address both issues. Redirecting standard output to a file. By adding a simple directive to the command that invokes a program, we can redirect its standard output to a file, either for permanent storage or for input to some other program at a later time. For example, the command specifies that the standard output stream is not to be printed in the terminal window, but instead is to be written to a text file named data. txt . Each call to StdOut. print() or StdOut. println() appends text at the end of that file. In this example, the end result is a file that contains 1,000 random values. Redirecting standard output from a file. Similarly, we can redirect standard input so that StdIn reads data from a file instead of the terminal window. For example, the commandreads a sequence of numbers from the file data. txt and computes their average value. Specifically, the lt symbol is a directive to implement the standard input stream by reading from the file data. txt instead of by waiting for the user to type something into the terminal window. When the program calls StdIn. readDouble() . the operating system reads the value from the file. This facility to redirect standard input from a file enables us to process huge amounts of data from any source with our programs, limited only by the size of the files that we can store. Connecting two programs. The most flexible way to implement the standard input and standard output abstractions is to specify that they are implemented by our own programs This mechanism is called piping . For example, the following commandspecifies that the standard output for RandomSeq and the standard input stream for Average are the same stream. Filters. For many common tasks, it is convenient to think of each program as a filter that converts a standard input stream to a standard output stream in some way, RangeFilter. java takes two command-line arguments and prints on standard output those numbers from standard input that fall within the specified range. Your operating system also provides a number of filters. For example, the sort filter puts the lines on standard input in sorted order: Another useful filter is more . which reads data from standard input and displays it in your terminal window one screenful at a time. For example, if you type you will see as many numbers as fit in your terminal window, but more will wait for you to hit the space bar before displaying each succeeding screenful. Standard drawing. Now we introduce a simple abstraction for producing drawings as output. We imagine an abstract drawing device capable of drawing lines and points on a two-dimensional canvas. The device is capable of responding to the commands that our programs issue in the form of calls to static methods in StdDraw. The primary interface consists of two kinds of methods: drawing commands that cause the device to take an action (such as drawing a line or drawing a point) and control commands that set parameters such as the pen size or the coordinate scales. Basic drawing commands. We first consider the drawing commands: These methods are nearly self-documenting: StdDraw. line(x0, y0, x1, y1) draws a straight line segment connecting the point ( x 0 . y 0 ) with the point ( x 1 . y 1 ). StdDraw. point(x, y) draws a spot centered on the point ( x . y ). The default coordinate scale is the unit square (all x - and y - coordinates between 0 and 1). The standard implementation displays the canvas in a window on your computers screen, with black lines and points on a white background. Your first drawing. The HelloWorld for graphics programming with StdDraw is to draw a triangle with a point inside. Triangle. java accomplishes this with three calls to StdDraw. line() and one call to StdDraw. point() . Control commands. The default canvas size is 512-by-512 pixels and the default coordinate system is the unit square, but we often want to draw plots at different scales. Also, we often want to draw line segments of different thickness or points of different size from the standard. To accommodate these needs, StdDraw has the following methods:For example, the two-call sequence sets the drawing coordinates to be within a bounding box whose lower-left corner is at ( x 0 . y 0 ) and whose upper-right corner is at ( x 1 . y 1 ). Filtering data to a standard drawing. PlotFilter. java reads a sequence of points defined by ( x . y ) coordinates from standard input and draws a spot at each point. It adopts the convention that the first four numbers on standard input specify the bounding box, so that it can scale the plot. Plotting a function graph. FunctionGraph. java plots the function y sin(4 x ) sin(20 x ) in the interval (0, pi). There are an infinite number of points in the interval, so we have to make do with evaluating the function at a finite number of points within the interval. We sample the function by choosing a set of x - values, then computing y - values by evaluating the function at each x - value. Plotting the function by connecting successive points with lines produces what is known as a piecewise linear approximation. Outline and filled shapes. StdDraw also includes methods to draw circles, rectangles, and arbitrary polygons. Each shape defines an outline. When the method name is just the shape name, that outline is traced by the drawing pen. When the method name begins with filled . the named shape is instead filled solid, not traced. The arguments for circle() define a circle of radius r the arguments for square() define a square of side length 2r centered on the given point and the arguments for polygon() define a sequence of points that we connect by lines, including one from the last point to the first point. Text and color. To annotate or highlight various elements in your drawings, StdDraw includes methods for drawing text, setting the font, and setting the the ink in the pen. In this code, java. awt. Font and java. awt. Color are abstractions that are implemented with non-primitive types that you will learn about in Section 3.1. Until then, we leave the details to StdDraw . The default ink color is black the default font is a 16-point plain Serif font. Double buffering. StdDraw supports a powerful computer graphics feature known as double buffering . When double buffering is enabled by calling enableDoubleBuffering() . all drawing takes place on the offscreen canvas . The offscreen canvas is not displayed it exists only in computer memory. Only when you call show() does your drawing get copied from the offscreen canvas to the onscreen canvas . where it is displayed in the standard drawing window. You can think of double buffering as collecting all of the lines, points, shapes, and text that you tell it to draw, and then drawing them all simultaneously, upon request. One reason to use double buffering is for efficiency when performing a large number of drawing commands. Computer animations. Our most important use of double buffering is to produce computer animations . where we create the illusion of motion by rapidly displaying static drawings. We can produce animations by repeating the following four steps: Clear the offscreen canvas. Draw objects on the offscreen Copy the offscreen canvas to the onscreen canvas. Wait for a short while. In support of these steps, the StdDraw has several methods: The Hello, World program for animation is to produce a black ball that appears to move around on the canvas, bouncing off the boundary according to the laws of elastic collision. Suppose that the ball is at position ( x . y ) and we want to create the impression of having it move to a new position, say ( x 0.01, y 0.02). We do so in four steps: Clear the offscreen canvas to white. Draw a black ball at the new position on the offscreen canvas. Copy the offscreen canvas to the onscreen canvas. Wait for a short while. To create the illusion of movement, BouncingBall. java iterates these steps for a whole sequence of positions of the ball. Images. Our standard draw library supports drawing pictures as well as geometric shapes. The command StdDraw. picture(x, y, filename) plots the image in the given filename (either JPEG, GIF, or PNG format) on the canvas, centered on (x, y). BouncingBallDeluxe. java illustrates an example where the bouncing ball is replaced by an image of a tennis ball. User interaction. Our standard draw library also includes methods so that the user can interact with the window using the mouse. A first example. MouseFollower. java is the HelloWorld of mouse interaction. It draws a blue ball, centered on the location of the mouse. When the user holds down the mouse button, the ball changes color from blue to cyan. A simple attractor. OneSimpleAttractor. java simulates the motion of a blue ball that is attracted to the mouse. It also accounts for a drag force. Many simple attractors. SimpleAttractors. java simulates the motion of 20 blue balls that are attracted to the mouse. It also accounts for a drag force. When the user clicks, the balls disperse randomly. Springs. Springs. java implements a spring system. Standard audio. StdAudio is a library that you can use to play and manipulate sound files. It allows you to play, manipulate and synthesize sound. We introduce some some basic concepts behind one of the oldest and most important areas of computer science and scientific computing: digital signal processing . Concert A. Concert A is a sine wave, scaled to oscillate at a frequency of 440 times per second. The function sin( t ) repeats itself once every 2pi units on the x - axis, so if we measure t in seconds and plot the function sin(2pi t times 440) we get a curve that oscillates 440 times per second. The amplitude ( y - value) corresponds to the volume. We assume it is scaled to be between minus1 and 1. Other notes. A simple mathematical formula characterizes the other notes on the chromatic scale. They are divided equally on a logarithmic (base 2) scale: there are twelve notes on the chromatic scale, and we get the i th note above a given note by multiplying its frequency by the ( i 12)th power of 2. When you double or halve the frequency, you move up or down an octave on the scale. For example 880 hertz is one octave above concert A and 110 hertz is two octaves below concert A. Sampling. For digital sound, we represent a curve by sampling it at regular intervals, in precisely the same manner as when we plot function graphs. We sample sufficiently often that we have an accurate representation of the curvemdasha widely used sampling rate is 44,100 samples per second. It is that simple: we represent sound as an array of numbers (real numbers that are between minus1 and 1).For example, the following code fragment plays concert A for 10 seconds. Play that tune. PlayThatTune. java is an example that shows how easily we can create music with StdAudio . It takes notes from standard input, indexed on the chromatic scale from concert A, and plays them on standard audio. Write a program MaxMin. java that reads in integers (as many as the user enters) from standard input and prints out the maximum and minimum values. Write a program Stats. java that takes an integer command-line argument n . reads n floating-point numbers from standard input, and prints their mean (average value) and sample standard deviation (square root of the sum of the squares of their differences from the average, divided by n minus1). Write a program LongestRun. java that reads in a sequence of integers and prints out both the integer that appears in a longest consecutive run and the length of the run. For example, if the input is 1 2 2 1 5 1 1 7 7 7 7 1 1 . then your program should print Longest run: 4 consecutive 7s . Write a program WordCount. java that reads in text from standard input and prints out the number of words in the text. For the purpose of this exercise, a word is a sequence of non-whitespace characters that is surrounded by whitespace. Write a program Closest. java that takes three floating-point command-line arguments (x, y, z), reads from standard input a sequence of point coordinates ((xi, yi, zi)), and prints the coordinates of the point closest to ((x, y, z)). Recall that the square of the distance between ((x, y, z)) and ((xi, yi, zi)) is ((x - xi)2 (y - yi)2 (z - zi)2). For efficiency, do not use Math. sqrt() or Math. pow() . Given the positions and masses of a sequence of objects, write a program to compute their center-of-mass or centroid. The centroid is the average position of the n objects, weighted by mass. If the positions and masses are given by ( x i . y i . m i ), then the centroid ( x . y . m ) is given by: Write a program Centroid. java that reads in a sequence of positions and masses ( x i . y i . m i ) from standard input and prints out their center of mass ( x . y . m ). Petunjuk model your program after Average. java. Write a program Checkerboard. java that takes a command-line argument n and plots an n-by-n checkerboard with red and black squares. Color the lower-left square red. Write a program Rose. java that takes a command-line argument n and plots a rose with n petals (if n is odd) or 2n petals (if n is even) by plotting the polar coordinates (r, theta) of the function r sin(n times theta) for theta ranging from 0 to 2pi radians. Below is the desired output for n 4, 7, and 8. Write a program Banner. java that takes a string s from the command line and display it in banner style on the screen, moving from left to right and wrapping back to the beginning of the string as the end is reached. Add a second command-line argument to control the speed. Write a program Circles. java that draws filled circles of random size at random positions in the unit square, producing images like those below. Your program should take four command-line arguments: the number of circles, the probability that each circle is black, the minimum radius, and the maximum radius. Creative Exercises Spirographs. Write a program Spirograph. java that takes three command-line arguments R, r, and a and draws the resulting spirograph. A spirograph (technically, an epicycloid) is a curve formed by rolling a circle of radius r around a larger fixed circle or radius R. If the pen offset from the center of the rolling circle is (ra), then the equation of the resulting curve at time t is given by Such curves were popularized by a best-selling toy that contains discs with gear teeth on the edges and small holes that you could put a pen in to trace spirographs. For a dramatic 3d effect, draw a circular image, e. g. earth. gif instead of a dot, and show it rotating over time. Heres a picture of the resulting spirograph when R 180, r 40, and a 15. Clock. Write a program Clock. java that displays an animation of the second, minute, and hour hands of an analog clock. Use the method StdDraw. show(1000) to update the display roughly once per second. Petunjuk this may be one of the rare times when you want to use the operator with a double - it works the way you would expect. Oscilloscope. Write a program Oscilloscope. java to simulate the output of an oscilloscope and produce Lissajous patterns. These patterns are named after the French physicist, Jules A. Lissajous, who studied the patterns that arise when two mutually perpendicular periodic disturbances occur simultaneously. Assume that the inputs are sinusoidal, so tha the following parametric equations describe the curve: Take the six parameters A x . w x . theta x . theta y . w y . and theta y from the command line. For example, the first image below has Ax Ay 1, w x 2, w y 3, theta x 20 degrees, theta y 45 degrees. The other has parameters (1, 1, 5, 3, 30, 45) Web Exercises Word and line count. Modify WordCount. java so that reads in text from standard input and prints out the number of characters, words, and lines in the text. Rainfall problem. Write a program Rainfall. java that reads in nonnegative integers (representing rainfall) one at a time until 999999 is entered, and then prints out the average of value (not including 999999). Remove duplicates. Write a program Duplicates. java that reads in a sequence of integers and prints back out the integers, except that it removes repeated values if they appear consecutively. For example, if the input is 1 2 2 1 5 1 1 7 7 7 7 1 1, your program should print out 1 2 1 5 1 7 1. Run length encoding. Write a program RunLengthEncoder. java that encodes a binary input using run length encoding. Write a program RunLengthDecoder. java that decodes a run length encoded message. Head and tail. Write programs Head. java and Tail. java that take an integer command line input N and print out the first or last N lines of the given file. (Print the whole file if it consists of For example the message VENI, VIDI, VICI is converted to YHQL, YLGL, YLFL. Write a program Caesar. java that takes a command-line argument k and applies a Caesar cipher with shift k to a sequence of letters read from standard input. If a letter is not an uppercase letter, simply print it back out. Caesar cipher decoding. How would you decode a message encrypted using a Caesar cipher Hint . you should not need to write any more code. Parity check. A Boolean matrix has the parity property when each row and each column has an even sum. This is a simple type of error-correcting code because if one bit is corrupted in transmission (bit is flipped from 0 to 1 or from 1 to 0) it can be detected and repaired. Heres a 4 x 4 input file which has the parity property: Write a program ParityCheck. java that takes an integer N as a command line input and reads in an N-by-N Boolean matrix from standard input, and outputs if (i) the matrix has the parity property , or (ii) indicates which single corrupted bit (i, j) can be flipped to restore the parity property, or (iii) indicates that the matrix was corrupted (more than two bits would need to be changed to restore the parity property). Use as little internal storage as possible. Hint: you do not even have to store the matrix Takagis function. Plot Takagis function: everywhere continuous, nowhere differentiable. Hitchhiker problem. You are interviewing N candidates for the sole position of American Idol. Every minute you get to see a new candidate, and you have one minute to decide whether or not to declare that person the American Idol. You may not change your mind once you finish interviewing the candidate. Suppose that you can immediately rate each candidate with a single real number between 0 and 1, but of course, you dont know the rating of the candidates not yet seen. Devise a strategy and write a program AmericanIdol that has at least a 25 chance of picking the best candidate (assuming the candidates arrive in random order), reading the 500 data values from standard input. Solution: interview for N2 minutes and record the rating of the best candidate seen so far. In the next N2 minutes, pick the first candidate that has a higher rating than the recorded one. This yields at least a 25 chance since you will get the best candidate if the second best candidate arrives in the first N2 minutes, and the best candidate arrives in the final N2 minutes. This can be improved slightly to 1e 0.36788 by using essentially the same strategy, but switching over at time Ne. Nested diamonds. Write a program Diamonds. java that takes a command line input N and plots N nested squares and diamonds. Below is the desired output for N 3, 4, and 5. Regular polygons. Create a function to plot an N-gon, centered on (x, y) of size length s. Use the function to draws nested polygons like the picture below. Bulging squares. Write a program BulgingSquares. java that draws the following optical illusion from Akiyoshi Kitaoka The center appears to bulge outwards even though all squares are the same size. Spiraling mice. Suppose that N mice that start on the vertices of a regular polygon with N sides, and they each head toward the nearest other mouse (in counterclockwise direction) until they all meet. Write a program to draw the logarithmic spiral paths that they trace out by drawing nested N-gons, rotated and shrunk as in this animation. Spiral. Write a program to draw a spiral like the one below. Globe. Write a program Globe. java that takes a real command-line argument alpha and plots a globe-like pattern with parameter alpha. Plot the polar coordinates (r, theta) of the function f(theta) cos(alpha times theta) for theta ranging from 0 to 7200 degrees. Below is the desired output for alpha 0.8, 0.9, and 0.95. Drawing strings. Write a program RandomText. java that takes a string s and an integer N as command line inputs, and writes the string N times at a random location, and in a random color. 2D random walk. Write a program RandomWalk. java to simulate a 2D random walk and animate the results. Start at the center of a 2N-by-2N grid. The current location is displayed in blue the trail in white. Rotating table. You are seated at a rotating square table (like a lazy Susan), and there are four coins placed in the four corners of the table. Your goal is to flip the coins so that they are either all heads or all tails, at which point a bell rings to notify you that you are done. You may select any two of them, determine their orientation, and (optionally) flip either or both of them over. To make things challenging, you are blindfolded, and the table is spun after each time you select two coins. Write a program RotatingTable. java that initializes the coins to random orientations. Then, it prompts the user to select two positions (1-4), and identifies the orientation of each coin. Next, the user can specify which, if any of the two coins to flip. The process repeats until the user solves the puzzle. Rotating table solver. Write another program RotatingTableSolver. java to solve the rotating table puzzle. One effective strategy is to choose two coins at random and flip them to heads. However, if you get really unlucky, this could take an arbitrary number of steps. Goal: devise a strategy that always solves the puzzle in at most 5 steps. Hex. Hex is a two-player board game popularized by John Nash while a graduate student at Princeton University, and later commercialized by Parker Brothers. It is played on a hexagonal grid in the shape of an 11-by-11 diamond. Write a program Hex. java that draws the board. Projectile motion with drag. Write a program BallisticMotion. java that plots the trajectory of a ball that is shot with velocity v at an angle theta. Account for gravitational and drag forces. Assume that the drag force is proportional to the square of the velocity. Using Newtons equations of motions and the Euler-Cromer method, update the position, velocity, and acceleration according to the following equations: Use G 9.8, C 0.002, and set the initial velocity to 180 and the angle to 60 degrees. Heart. Write a program Heart. java to draw a pink heart: Draw a diamond, then draw two circles to the upper left and upper right sides. Changing square. Write a program that draws a square and changes its color each second. Simple harmonic motion. Repeat the previous exercise, but animate the Lissajous patterns as in this applet. Ex: A B w x w y 1, but at each time t draw 100 (or so) points with phi x ranging from 0 to 720 degrees, and phi x ranging from 0 to 1080 degrees. Bresenhams line drawing algorithm. To plot a line segment from (x1, y1) to (x2, y2) on a monitor, say 1024-by-1024, you need to make a discrete approximation to the continuous line and determine exactly which pixels to turn on. Bresenhams line drawing algorithm is a clever solution that works when the slope is between 0 and 1 and x1 Modify Bresenhams algorithm to handle arbitrary line segments. Millers madness. Write a program Madness. java to plot the parametric equation: where the parameter t is in radians. You should get the following complex picture. Experiment by changing the parameters and produce original pictures. Fays butterfly. Write a program Butterfly. java to plot the polar equation: where the parameter t is in radians. You should get an image like the following butterfly-like figure. Experiment by changing the parameters and produce original pictures. Student database. The file students. txt contains a list of students enrolled in an introductory computer science class at Princeton. The first line contains an integer N that specifies the number of students in the database. Each of the next N lines consists of four pieces of information, separated by whitespace: first name, last name, email address, and section number. The program Students. java reads in the integer N and then N lines of data of standard input, stores the data in four parallel arrays (an integer array for the section number and string arrays for the other fields). Then, the program prints out a list of students in section 4 and 5. Shuffling. In the October 7, 2003 California state runoff election for governor, there were 135 official candidates. To avoid the natural prejudice against candidates whose names appear at the end of the alphabet (Jon W. Zellhoefer), California election officials sought to order the candidates in random order. Write a program program Shuffle. java that takes a command-line argument N, reads in N strings from standard input, and prints them back out in shuffled order. (California decided to randomize the alphabet instead of shuffling the candidates. Using this strategy, not all N possible outcomes are equally likely or even possible For example, two candidates with very similar last names will always end up next to each other.) Reverse. Write a program Reverse. java that reads in an arbitrary number of real values from standard input and prints them in reverse order. Time series analysis. This problem investigates two methods for forecasting in time series analysis. Moving average or exponential smoothing. Polar plots. Create any of these polar plots. Java games. Use StdDraw. java to implement one of the games at javaunlimited. Consider the following program. Suppose the file input. txt contains the following integers: What is the contents of the array a after running the following command High-low. Shuffle a deck of cards, and deal one to the player. Prompt the player to guess whether the next card is higher or lower than the current card. Repeat until player guesses it wrong. Game show. used this. Elastic collisions. Write a program CollidingBalls. java that takes a command-line argument n and plots the trajectories of n bouncing balls that bounce of the walls and each other according to the laws of elastic collisions. Assume all the balls have the same mass. Elastic collisions with obstacles. Each ball should have its own mass. Put a large ball in the center with zero initial velocity. Brownian motion. Statistical outliers. Modify Average. java to print out all the values that are larger than 1.5 standard deviations from the mean. You will need an array to store the values. Optical illusions. Create a Kofka ring or one of the other optical illusions collected by Edward Adelson. Computer animation. In 1995 James Gosling presented a demonstration of Java to Sun executives, illustrating its potential to deliver dynamic and interactive Web content. At the time, web pages were fixed and non-interactive. To demonstrate what the Web could be, Gosling presented applets to rotate 3D molecules, visualize sorting routines, and Duke cart-wheeling across the screen. Java was officially introduced in May 1995 and widely adopted in the technology sector. The Internet would never be the same. Program Duke. java reads in the 17 images T1.gif through T17.gif and produces the animation. To execute on your computer, download the 17 GIF files and put in the same directory as Duke. java . (Alternatively, download and unzip the file duke. zip or duke. jar to extract all 17 GIFs.) Cart-wheeling Duke. Modify Duke. java so that it cartwheels 5 times across the screen, from right to left, wrapping around when it hits the window boundary. Repeat this cart-wheeling cycle 100 times. Petunjuk after displaying a sequence of 17 frames, move 57 pixels to the left and repeat. Name your program MoreDuke. java. Tac (cat backwards). Write a program Tac. java that reads lines of text from standard input and prints the lines out in reverse order. Game. Implement the game dodge using StdDraw . move a blue disc within the unit square to touch a randomly placed green disc, while avoiding the moving red discs. After each touch, add a new moving red disc. Simple harmonic motion. Create an animation like the one below from Wikipedia of simple harmonic motion. Yin yang. Draw a yin yang using StdDraw. arc() . Twenty questions. Write a program QuestionsTwenty. java that plays 20 questions from the opposite point of view: the user thinks of a number between 1 and a million and the computer makes the guesses. Use binary search to ensure that the computer needs at most 20 guesses. Write a program DeleteX. java that reads in text from standard input and deletes all occurrences of the letter X. To filter a file and remove all Xs, run your program with the following command: Write a program ThreeLargest. java that reads integers from standard input and prints out the three largest inputs. Write a program Pnorm. java that takes a command-line argument p, reads in real numbers from standard input, and prints out their p-norm . The p-norm norm of a vector (x 1 . x N ) is defined to be the pth root of (x 1 p x 2 p . x N p ). Consider the following Java program. Suppose that the file input. txt contains the integers 1 and 1. What does the following command do Modify Add. java so that it re-asks the user to enter two positive integers if the user types in a non-positive integer. Modify TwentyQuestions. java so that it re-asks the user to enter a response if the user types in something other than true or false . Hint: add a do-while loop within the main loop. Nonagram. Write a program to plot a nonagram. Star polygons. Write a program StarPolygon. java that takes two command line inputs p and q, and plots the - star polygon. Complete graph. Write a program to plot that takes an integer N, plots an N-gon, where each vertex lies on a circle of radius 256. Then draw a gray line connecting each pair of vertices. Necker cube. Write a program NeckerCube. java to plot a Necker cube. What happens if you move the StdDraw. clear(Color. BLACK) command to before the beginning of the while loop in BouncingBall. java. Jawaban. try it and observe a nice woven 3d pattern with the given starting velocity and position. What happens if you change the parameter of StdDraw. show() to 0 or 1000 in BouncingBall. java. Write a program to plot a circular ring of width 10 like the one below using two calls to StdDraw. filledCircle() . Write a program to plot a circular ring of width 10 like the one below using a nested for loop and many calls to StdDraw. point() . Write a program to plot the Olympic rings. Write a program BouncingBallDeluxe. java that embellishes BouncingBall. java by playing a sound effect upon collision with the wall using StdAudio and the sound file pipebang. wav. Last modified on February 20, 2017. Copyright copy 2000ndash2016 Robert Sedgewick and Kevin Wayne. Seluruh hak cipta.

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