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Re: NaN problems [message #43777 is a reply to message #43584]

Mon, 25 April 2005 16:51

yp
Messages: 42
Registered: February 2005

Member

David Lopez Pons wrote:
> Hi everybody.
> I have a problem detecting NaN values. When I write:
>
> err=findgen(10)-5
> res=err^2.5
> print,res
>
> NaN NaN NaN NaN NaN
> 0.00000 1.00000 5.65685 15.5885 32.0000
>
> Until here everything is OK, but now i want to look for Nan values in
my
> result so I write:
>
> print,where(res EQ !values.f_nan)
> -1
>
> I can see the NaN values in res. Why they are not equal to
!values.f_nan?

Use
print,where(FINITE(res) EQ 0)

instead. FINITE returns 1 or 0 if the argument is True (Finite) or
False (NaN or Inf) respectively.
Alternatively you can use:
print,where(FINITE(res,/NAN) EQ 1)

yas

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[Message index]

		NaN problems By: David Lopez Pons on Thu, 21 April 2005 06:37
		Re: NaN problems By: R.Bauer on Sat, 23 April 2005 12:48
		Re: NaN problems By: David Fanning on Fri, 22 April 2005 20:38
		Re: NaN problems By: yp on Mon, 25 April 2005 16:51
		Re: NaN problems By: yp on Mon, 25 April 2005 16:49
		Re: NAN Problem By: R.Bauer on Thu, 14 January 2010 00:49
		Re: NAN Problem By: penteado on Wed, 13 January 2010 16:15
		Re: NAN Problem By: R.G.Stockwell on Wed, 13 January 2010 16:00
		Re: NAN Problem By: Foldy Lajos on Wed, 13 January 2010 13:00
		Re: NAN Problem By: penteado on Wed, 13 January 2010 12:59
		Re: NAN Problem By: David Fanning on Wed, 13 January 2010 12:39
		Re: NAN Problem By: jeanh on Wed, 13 January 2010 12:28

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