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

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  24 <p class="p1"><span class="s1"><b>Pexprand<span class="Apple-tab-span"> </span></b></span><span class="Apple-tab-span"> </span><span class="Apple-tab-span">    </span><b>random values that follow a Exponential Distribution</b></p>
  25 <p class="p2"><br></p>
  26 <p class="p1">superclass: Pattern</p>
  27 <p class="p2"><br></p>
  28 <p class="p2"><br></p>
  29 <p class="p1"><b>Pexprand(lo, hi, length)</b></p>
  30 <p class="p2"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  31 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><b>lo, hi<span class="Apple-tab-span">   </span></b><span class="Apple-tab-span">        </span><span class="Apple-tab-span">    </span>lower and upper boundary of values (default: 0.0001 and 1.0)</p>
  32 <p class="p1"><span class="Apple-tab-span">     </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>lo and hi should both be positive or negative (their range should not cross 0)</p>
  33 <p class="p1"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><b>length</b><span class="Apple-tab-span">       </span><span class="Apple-tab-span">    </span>number of values produced<span class="Apple-converted-space">  </span>(default: inf)</p>
  34 <p class="p2"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  35 <p class="p3"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span></p>
  36 <p class="p3"><br></p>
  37 <p class="p4">// example</p>
  38 <p class="p3"><br></p>
  39 <p class="p5">(</p>
  40 <p class="p5"><span class="s2">var</span> a;</p>
  41 <p class="p5">a = <span class="s2">Pexprand</span>.new(0.0001, 1, <span class="s2">inf</span>);</p>
  42 <p class="p5">c = a.asStream.nextN(500);</p>
  43 <p class="p4">// plot the values</p>
  44 <p class="p5">c.plot(bounds: <span class="s2">Rect</span>(10, 10, 520, 380), discrete: <span class="s2">true</span>, parent: w);</p>
  45 <p class="p4">// a histogram of the values</p>
  46 <p class="p5">c.histo(500).plot(bounds: <span class="s2">Rect</span>(10, 410, 520, 380), parent: w);</p>
  47 <p class="p5">)</p>
  48 <p class="p3"><br></p>
  49 <p class="p4">// sound example</p>
  50 <p class="p5">(</p>
  51 <p class="p6"><span class="s2">SynthDef</span><span class="s3">(</span>\help_sinegrain<span class="s3">,<span class="Apple-converted-space"> </span></span></p>
  52 <p class="p5"><span class="Apple-tab-span">     </span>{ <span class="s2">arg</span> out=0, freq=440, sustain=0.05;</p>
  53 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">var</span> env;</p>
  54 <p class="p5"><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>
  55 <p class="p5"><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>
  56 <p class="p5"><span class="Apple-tab-span">     </span>}).add;</p>
  57 <p class="p5">)</p>
  58 <p class="p3"><br></p>
  59 <p class="p3"><br></p>
  60 <p class="p5">(</p>
  61 <p class="p5"><span class="s2">var</span> a;</p>
  62 <p class="p5">a = <span class="s2">Pexprand</span>(0.0001, 1.0,<span class="s2">inf</span>).asStream;</p>
  63 <p class="p5">{</p>
  64 <p class="p5"><span class="Apple-tab-span">     </span>loop {</p>
  65 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span><span class="s2">Synth</span>(<span class="s4">\help_sinegrain</span>, [<span class="s4">\freq</span>, a.next * 600 + 300]);</p>
  66 <p class="p5"><span class="Apple-tab-span">     </span><span class="Apple-tab-span">    </span>0.02.wait;</p>
  67 <p class="p5"><span class="Apple-tab-span">     </span>}</p>
  68 <p class="p5">}.fork;</p>
  69 <p class="p5">)</p>
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