TOMAZ wrote:
> Hi I made a program which basically averages data from a file. The data is
> stored as complex float and I'm reading it with fread with no problem. Some
> data are taged as NAN (at least ENVI, an image procesing soft read these
> values as NAN). If I average the whole data adding a number with a NAN gives
> me a NAN and my whole program fails.
>
> What I did is the folowing which doesn't seems to work:
>
> if(cabsf(zhhzhh)!= NAN)
> {
> printf("%f\n", cabsf(zhhzhh));
> }
>
> For some reason the test seeams to be positive all the time, I keep printing
> NAN's ("nan" actualy).
>
> Any idea?
NaN is not equal to anything, including itself.
To test for NaN, use isnan(). If you don't have isnan() (it's C99, not
C89), test whether "x != x" (true for NaN, false for everything else).
--
Glynn Clements <glynn@xxxxxxxxxxxxxxxxxx>
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