[PD] [sqosc~]-issues

Martin Peach martin.peach at sympatico.ca
Tue Mar 27 06:37:13 CEST 2007

Thanks, Charles,
For Windows, I found
int _isnan(double x) in float.h; it returns non-zero if x is NaN.
Also in float.h,
int _finite(double x) returns zero if the number is +- infinite or a 
NaN, so that would seem to cover every possibility.
int _fpclass(double x) returns a specific code for each type of NaN as 
well as zero and non-zero numbers.
There don't seem to be any float versions of these.
If the overhead is not too high it would make sense to use one of these 
in any dsp routine that might generate such values.
Ideally it should be on the input to [dac~] so it only needs to be 
called once per sample, but I'll try it on sqosc~ to see what happens...


Charles Henry wrote:
> okay, (on linux) you find math.h in /usr/include/ which includes a
> file /usr/include/bits/mathcalls.h
> there are three functions
> int finite(double x) -- returns 1, if x is not NaN or inf
> int isinf(double x) -- returns 1, if x is inf or -inf
> int isnan(double x) -- returns 1, if x is NaN
> int finitef(float x),
> int isnanf(float x), and
> int isinff(float x)
> are the float versions.
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