From: "Lukasz Mielicki" <lukasz.mielicki@tahoe.pl>
To: linux-c-programming@vger.kernel.org
Subject: Re: NAN and complex.h
Date: Mon, 24 Sep 2007 08:31:23 +0200 [thread overview]
Message-ID: <014001c7fe74$87112e20$2214a8c0@tahoec> (raw)
In-Reply-To: 12766829.post@talk.nabble.com
> 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
prev parent reply other threads:[~2007-09-24 6:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-18 21:52 NAN and complex.h TOMAZ
2007-09-18 22:21 ` Glynn Clements
2007-09-24 6:31 ` Lukasz Mielicki [this message]
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