Pif Pattern-based conditional expression.

superclass: Pattern

Pif(condition, iftrue, iffalse, default)

condition: A pattern or stream returning a Boolean value.

iftrue: This stream is evaluated if the Boolean is true.

iffalse: This stream is evaluated if the Boolean is false.

default: This value (not stream) is returned if "iftrue" or "iffalse" return nil at any time.

p = Pif(Pfunc({ 0.3.coin }), Pwhite(0, 9, inf), Pwhite(100, 109, inf)).asStream;

p.nextN(20);

// 7 of the 20 values, or roughly 30%, are in the 0-9 range:

[ 105, 107, 107, 8, 100, 3, 105, 5, 107, 106, 1, 104, 8, 102, 102, 4, 108, 8, 109, 101 ]

// sound example

(

SynthDef(\help_sinegrain, 

{ arg out=0, freq=440, sustain=0.05;

var env;

env = EnvGen.kr(Env.perc(0.01, sustain, 0.2), doneAction:2);

Out.ar(out, SinOsc.ar(freq, 0, env))

}).add;

)

(

var a;

a = Pif(Pfunc({ 0.3.coin }), Pn(Pseries(0.5, 0.1, 10)), Pn(Pseries(6, -0.1, 10))).asStream;

{

loop {

Synth(\help_sinegrain, [\freq, a.next * 600 + 300]);

0.2.wait;

}

}.fork;

)