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Re: where() and IEEE NaN [message #17818 is a reply to message #17816]

Fri, 05 November 1999 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <7vv1j3$6ro$1@ra.nrl.navy.mil>,
Todd Bowers <tbowers@nrlssc.navy.mil> wrote:
> 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

Unfortunately, on some platforms IDL is not IEEE compliant which greatly
limits IDL's usefulness as a cross platform system. RSI could easily fix
this on most platforms with a compiler option, but they choose not to.
The only correct response for any array to "print,where(a eq !values.F_NaN)"
is "-1".

Eric

--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
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[Message index]

		Re: where() and IEEE NaN By: korpela on Mon, 08 November 1999 00:00
		Re: where() and IEEE NaN By: badastro on Mon, 08 November 1999 00:00
		Re: where() and IEEE NaN By: Pavel Romashkin on Mon, 08 November 1999 00:00
		Re: where() and IEEE NaN By: thompson on Mon, 08 November 1999 00:00
		Re: where() and IEEE NaN By: jsb on Thu, 11 November 1999 00:00
		Re: where() and IEEE NaN By: korpela on Sat, 06 November 1999 00:00
		Re: where() and IEEE NaN By: Vincenzo Andretta on Sat, 06 November 1999 00:00
		Re: where() and IEEE NaN By: davidf on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: davidf on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: Pavel Romashkin on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: thompson on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: T Bowers on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: badastro on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: davidf on Fri, 05 November 1999 00:00
		Re: where() and IEEE NaN By: korpela on Fri, 05 November 1999 00:00

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