Pxrand embed values randomly chosen from a list

like Prand, returns one item from the list at random for each repeat, but Pxrand never

repeats the same element twice in a row. 

see also: Pwrand

(

var a, b;

a = Pxrand.new(#[1, 2, 3], 10); // return 10 items

b = a.asStream;

11.do({ b.next.postln; });

)

Pxrand used as a sequence of pitches:

(

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;

)

(

a = Pxrand(#[60, 61, 63, 65, 72], inf).asStream;

Routine({

loop({

Synth(\help_sinegrain, [\freq, a.next.midicps]);

0.1.wait;

})

}).play;

)