Help/Streams-Patterns-Events/Patterns/Pwrand.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
   2 <html>
   3 <head>
   4 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   5 <meta http-equiv="Content-Style-Type" content="text/css">
   6 <title></title>
   7 <meta name="Generator" content="Cocoa HTML Writer">
   8 <meta name="CocoaVersion" content="1038.25">
   9 <style type="text/css">
  10 p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica}
  11 p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px}
  12 p.p3 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco}
  13 p.p4 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Monaco; min-height: 16.0px}
  14 p.p5 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #007300}
  15 p.p6 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; min-height: 12.0px}
  16 p.p7 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Monaco; color: #0000bf}
  17 span.s1 {font: 18.0px Helvetica}
  18 span.s2 {color: #0000bf}
  19 span.s3 {color: #bf0000}
  20 span.s4 {color: #000000}
  21 span.s5 {color: #007300}
  22 span.Apple-tab-span {white-space:pre}
  23 </style>
  24 </head>
  25 <body>
  26 <p class="p1"><span class="s1"><b>Pwrand</b></span> <span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><span class="Apple-tab-span">    </span><b>embed values randomly chosen from a list</b></p>
  27 <p class="p2"><br></p>
  28 <p class="p1"><b>superclass: </b><a href="ListPattern.html"><span class="s2">ListPattern</span></a></p>
  29 <p class="p2"><br></p>
  30 <p class="p1">returns one item from the list at random for each repeat, the probability</p>
  31 <p class="p1">for each item is determined by a list of weights which should sum to 1.0.</p>
  32 <p class="p2"><br></p>
  33 <p class="p3">(</p>
  34 <p class="p3"><span class="s2">var</span> a, b;</p>
  35 <p class="p3">a = <span class="s2">Pwrand</span>.new([1, 2, 3], [1, 3, 5].normalizeSum, 6);<span class="Apple-tab-span">        </span><span class="s3">// return 6 items</span></p>
  36 <p class="p3">b = a.asStream;</p>
  37 <p class="p3">7.do({ b.next.postln; });</p>
  38 <p class="p3">)</p>
  39 <p class="p4"><br></p>
  40 <p class="p1">Prand used as a sequence of pitches:</p>
  41 <p class="p4"><br></p>
  42 <p class="p3">(</p>
  43 <p class="p5"><span class="s2">SynthDef</span><span class="s4">(</span>\help_sinegrain<span class="s4">,<span class="Apple-converted-space"> </span></span></p>
  44 <p class="p3"><span class="Apple-tab-span">     </span>{ <span class="s2">arg</span> out=0, freq=440, sustain=0.05;</p>
  45 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">var</span> env;</p>
  46 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>env = <span class="s2">EnvGen</span>.kr(<span class="s2">Env</span>.perc(0.01, sustain, 0.2), doneAction:2);</p>
  47 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">Out</span>.ar(out, <span class="s2">SinOsc</span>.ar(freq, 0, env))</p>
  48 <p class="p3"><span class="Apple-tab-span">     </span>}).add;</p>
  49 <p class="p3">)</p>
  50 <p class="p6"><br></p>
  51 <p class="p6"><br></p>
  52 <p class="p6"><br></p>
  53 <p class="p3">(</p>
  54 <p class="p3">a = <span class="s2">Pwrand</span>([60, 61, 63, 65, 72], [10, 2, 3, 1, 3].normalizeSum, <span class="s2">inf</span>).asStream;</p>
  55 <p class="p7">Routine<span class="s4">({</span></p>
  56 <p class="p3"><span class="Apple-tab-span">     </span>loop({</p>
  57 <p class="p3"><span class="Apple-tab-span">     </span><span class="s2">Synth</span>(<span class="s5">\help_sinegrain</span>, [<span class="s5">\freq</span>, a.next.midicps]);</p>
  58 <p class="p3"><span class="Apple-tab-span">     </span>0.1.wait;</p>
  59 <p class="p3"><span class="Apple-tab-span">     </span>})</p>
  60 <p class="p3">}).play;</p>
  61 <p class="p3">)</p>
  62 <p class="p6"><br></p>
  63 </body>
  64 </html>