rsc3/doc-schelp/HelpSource/Classes/Pseq.scrbl

#lang scribble/manual
@(require (for-label racket))

@title{Pseq}
 sequentially embed values in a list@section{related}
  Classes/Pser
@section{categories}
  Streams-Patterns-Events>Patterns>List

@section{description}


Cycles over a list of values. The repeats variable gives the number of times to repeat the entire list.

@section{Examples}
 


@racketblock[
(
var a, b;
a = Pseq([1, 2, 3], 2);	// repeat twice
b = a.asStream;
7.do({ b.next.postln; });
)
::

Pseq also has an offset argument which gives a starting offset into the list.
]

@racketblock[
(
var a, b;
a = Pseq([1, 2, 3, 4], 3, 2);	// repeat 3, offset 2
b = a.asStream;
13.do({ b.next.postln; });
)
::

You can pass a function for the repeats variable that gets evaluated when the stream is created.
]

@racketblock[
(
var a, b;
a = Pseq([1, 2], { rrand(1, 3) });	// repeat 1,2, or 3 times
b = a.asStream;
7.do({ b.next.postln; });
)
::

If you specify the value inf for the repeats variable, then it will repeat indefinitely.
]

@racketblock[
(
var a, b;
a = Pseq([1, 2, 3], inf);	// infinite repeat
b = a.asStream;
10.do({ b.next.postln; });
)
::


Pseq used as a sequence of pitches:
]

@racketblock[
(
SynthDef(\help_sinegrain,
	{ arg out=0, freq=440, sustain=0.05;
		var env;
		env = EnvGen.kr(Env.perc(0.01, sustain, 0.2), doneAction: Done.freeSelf);
		Out.ar(out, SinOsc.ar(freq, 0, env))
	}).add;
)

(
a = Pseq(#[60, 61, 63, 65, 72], inf).asStream;
Routine({
	loop({
		Synth(\help_sinegrain, [\freq, a.next.midicps]);
		0.2.wait;
	})
}).play;
)
::
]