51 lines
988 B
Text
51 lines
988 B
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Pwrand}
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embed values randomly chosen from a list@section{related}
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Classes/Prand, Classes/Pxrand
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@section{categories}
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Streams-Patterns-Events>Patterns>List
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@section{description}
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Returns one item from the list at random for each repeat, the probability for each item is determined by a list of weights which should sum to 1.0.
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@section{Examples}
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@racketblock[
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(
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var a, b;
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a = Pwrand.new([1, 2, 3], [1, 3, 5].normalizeSum, 6); // return 6 items
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b = a.asStream;
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7.do({ b.next.postln; });
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)
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//Prand used as a sequence of pitches:
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(
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SynthDef(\help_sinegrain,
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{ arg out=0, freq=440, sustain=0.05;
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var env;
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env = EnvGen.kr(Env.perc(0.01, sustain, 0.2), doneAction: Done.freeSelf);
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Out.ar(out, SinOsc.ar(freq, 0, env))
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}).add;
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)
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(
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a = Pwrand([60, 61, 63, 65, 72], [10, 2, 3, 1, 3].normalizeSum, inf).asStream;
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Routine({
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loop({
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Synth(\help_sinegrain, [\freq, a.next.midicps]);
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0.1.wait;
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})
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}).play;
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)
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::
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]
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