78 lines
1 KiB
Text
78 lines
1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Pgeom}
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geometric series pattern@section{related}
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Classes/Pseries
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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 a stream that behaves like a geometric series.
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@section{ClassMethods}
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@section{method}
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new
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@section{argument}
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start
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start value.
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@section{argument}
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grow
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multiplication factor.
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@section{argument}
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length
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number of values produced.
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@section{Examples}
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@racketblock[
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(
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var a;
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a = Pgeom(1.0, 1.1, inf);
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a.asStream.nextN(100).plot;
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)
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// sound example
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(
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SynthDef(\help_sinegrain,
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{ arg out=0, freq=440, sustain=0.05, amp=0.1;
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var env;
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env = EnvGen.kr(Env.perc(0.01, sustain, 0.2, amp), 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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var a;
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a = Pgeom(300, 1.03, 70).asStream;
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{
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a.do { |val|
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Synth(\help_sinegrain, [\freq, val]);
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0.02.wait;
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}
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}.fork;
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)
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(
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Pbind(
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\dur, 0.01,
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\instrument, \help_sinegrain,
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\freq, Pgeom(800, Pbrown(0.99, 1.01, 0.01, inf), inf)
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).play;
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)
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::
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]
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