[PD] expr and expr(~) vs individual operators

Frank Barknecht fbar at footils.org
Sun Jan 16 23:00:31 CET 2005

Michal Seta hat gesagt: // Michal Seta wrote:

> "Roman Haefeli" <reduzierer at yahoo.de> writes:
> > i remember that someone from the list wrote that using [expr] or [expr~]
> > consumes more cpu than doing the equivalent with 'conventional' objs.
> > but i can't remember the reason and how much the difference is. maybe
> > you'll find it by searching the archive.
> I remember that a long time ago, on a Pentium 566Mhz I found that the
> combination of [expr~] and regular pd operators was the most efficient
> solution to complex equasions.  YMMV, but I think that only
> experimentation will give the best results.  On my AthlonXP 2400 the
> difference between the 2 approaches was negligible (in that
> particular case).

I didn't do any extensive benchmarking, but I suppose, that the
difference will not really matter, and if it does, only benchmarking
your actual patches will give the solution.

But in any way, the expr-family of objects is much faster when it
comes to do the patching itself and can be a major time saver. I would
encourage anyone to use them a lot. Something like: 

expr if ( $f1 > 0, 1/$f1, pow($f1, 2) )

might look a bit scary at first, but if you do this as single objects,
it is really longwinded. 

 Frank Barknecht                               _ ______footils.org__

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