FW: NAN and complex.h

FW: NAN and complex.h

[이종민]

 

-----Original Message-----
From: linux-c-programming-owner@vger.kernel.org [mailto:linux-c-programming-
owner@vger.kernel.org] On Behalf Of Lukasz Mielicki
Sent: Monday, September 24, 2007 3:31 PM
To: linux-c-programming@vger.kernel.org
Subject: Re: NAN and complex.h

> 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?

use isnan or isfinite to check for wrong values

BX
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