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where() and IEEE NaN [message #17820]

Fri, 05 November 1999 00:00

T Bowers
Messages: 56
Registered: May 1998

Member

IDL> a = [1,2,!Values.F_NaN,4,!Values.F_NaN]
IDL> print, a
1.00000 2.00000 NaN 4.00000 NaN
IDL> print, where(a EQ !Values.F_NaN)
0 1 2 3 4

Hmmmmmm.... is this a known feature? The where() help says
nothin' about NaN's.
IDL v5.2a

Thanks
Todd

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Re: where() and IEEE NaN [message #18033 is a reply to message #17820]

Fri, 26 November 1999 00:00

kobayash
Messages: 5
Registered: July 1999

Junior Member

On Sat, 06 Nov 1999 13:15:44 -0500, Vincenzo Andretta
<andretta@hector.gsfc.nasa.gov> wrote:

>
>
> Try:
>
> WHERE(FINITE(array,/NaN) eq 1)
>

I usually just use WHERE(FINITE(array,/NaN))

Is it a better practice to put in the 'eq 1' part?

Ken Kobayashi
kobayash@sxt2.mtk.nao.ac.jp
http://www.din.or.jp/~kobaken/

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