HelpSource/Classes/Pgeom.schelp

   1 class:: Pgeom
   2 summary:: geometric series pattern
   3 related:: Classes/Pseries
   4 categories:: Streams-Patterns-Events>Patterns>List
   5
   6 description::
   7
   8 Returns a stream that behaves like a geometric series.
   9
  10 ClassMethods::
  11
  12 method::new
  13
  14 argument::start
  15 start value.
  16
  17 argument::grow
  18 multiplication factor.
  19
  20 argument::length
  21 number of values produced.
  22
  23 Examples::
  24
  25 code::
  26 (
  27 var a;
  28 a = Pgeom(1.0, 1.1, inf);
  29 a.asStream.nextN(100).plot;
  30 )
  31
  32
  33 // sound example
  34 (
  35 SynthDef(\help_sinegrain,
  36         { arg out=0, freq=440, sustain=0.05, amp=0.1;
  37                 var env;
  38                 env = EnvGen.kr(Env.perc(0.01, sustain, 0.2, amp), doneAction:2);
  39                 Out.ar(out, SinOsc.ar(freq, 0, env))
  40         }).add;
  41 )
  42
  43
  44 (
  45 var a;
  46 a = Pgeom(300, 1.03, 70).asStream;
  47 {
  48         a.do { |val|
  49                 Synth(\help_sinegrain, [\freq, val]);
  50                 0.02.wait;
  51         }
  52 }.fork;
  53 )
  54
  55 (
  56 Pbind(
  57         \dur, 0.01,
  58         \instrument, \help_sinegrain,
  59         \freq, Pgeom(800, Pbrown(0.99, 1.01, 0.01, inf), inf)
  60 ).play;
  61 )
  62 ::