Thank you very much, Casper! Although I got another solution myself (my code became really big so I abstracted some classes), it is good to know that I can use this method when trying something quicker. Best regards! On Mon, Oct 5, 2015 at 3:01 AM, Casper Schipper wrote:

Hello Jean,

You can solve your problem by declaring an empty variable (Osc is the superclass of both SinOsc and TriOsc):

fun void playForPixels(int totalpixels, string osc) { Osc @ sh; if ( osc == "sin" ) { new SinOsc @=> sh; } else { if ( osc == "tri" ) { new TriOsc @=> sh; } else { new SawOsc @=> sh; } }

440 => osc.freq; // Still allows you to control frequency...

Best, Casper

On Oct 5, 2015, at 04:19, Jean Menezes da Rocha wrote:

Hello, guys,

I am trying to choose which UGen to load (SinOsc, TriOsc or SawOsc) based on a given condition. This sample code

fun void playForPixels(int totalpixels, string osc) { if ( osc == "sin" ) { SinOsc sh; } else { if ( osc == "tri" ) { TriOsc sh; } else { SawOsc sh; } }

Envelope e => Gain g => dac;

( ( s + v) * 100 )::ms => dur dura; s * v => g.gain; ( dura / 40 ) / second => e.time;

h * 2000 => sh.freq;

sh => e;

(code goes on...)

gives me the following error:

[listener.ck]:line(38): undefined variable/member 'sh' in class/namespace 'Pixel'... [listener.ck]: ...in function 'playForPixels'

(i am working inside a class named 'Pixel', in case it is important).

How can I load my UGen and make it persist outside the scope of the if clause?

Thanks in advance! -- Jean Menezes da Rocha Compositor Professor -- Faculdades Est Mestre e Doutorando em Composição pela Universidade Federal da Bahia _______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users

_______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users

-- Jean Menezes da Rocha Compositor Professor -- Faculdades Est Mestre e Doutorando em Composição pela Universidade Federal da Bahia