[sc-users] BooleanUGens (was Re: conditional statement in SynthDef)

[Joshua Parmenter <joshpar@xxxxxxx>]

Hi everyone,

After talking to Dan a little bit, I decided to make a few quick  
UGens that do some basic Boolean stuff.  They return 0 for false, 1  
for true.  There is:

IsEqual, IsNotEqual, IsLess, IsLessOrEqual, IsGreater, IsGreaterOrEqual

These can be used pretty easily in the SynthDef if statements for a  
good either / or result.

There are helpfiles for them, as well as a new helpfile for Balance  
(which also has some improvements).

You can get them all at:

http://homepage.mac.com/joshpar/JoshUgenPack.tar.gz

Josh

******************************************
Joshua D. Parmenter
http://homepage.mac.com/joshpar/

"...Some people think a composer's supposed to please them, but in a  
way a composer is a chronicler... He's supposed to report on what  
he's seen and lived."
                                                                        
     -Charles Mingus

On Sep 3, 2005, at 1:33 AM, Dan Stowell wrote:

> 2005/8/31, James Harkins <jamshark70@xxxxxxxxx>:
>
> > ...
> > Also remember that the server knows nothing about the language.
> > "if(high == 1)" is meaningless to the server (as is "freq = 220"  
> > in the
> > if branch). The expressions are evaluated in the language once, when
> > the synthdef is built, and the result is hardcoded into the synthdef
> > structure. And, of course, anOutputProxy == 1 is always going to be
> > false.
> >
> >
> > > and < comparisons should work, though. someUGen > someUGen  
> > > produces a
> > BinaryOpUGen that outputs 0 when false and 1 when true.
> >
> >        freq = if(high > 0, 440, 220);
>
>
> OK, maybe this is a naive question, but why should > and < behave so
> very differently from == within a synth? Seems counter-intuitive. Is
> there any reason why "someUGen == someUGen" shouldn't produce a
> BinaryOpUGen that outputs 1 when the signals match and 0 when they
> don't?
>
> Dan
>
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