comp.lang.idl-pvwave archive: archive » Re: where() and IEEE NaN

Home » Public Forums » archive » Re: where() and IEEE NaN

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: where() and IEEE NaN [message #17807 is a reply to message #17803]

Fri, 05 November 1999 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

badastro@smart.net (Philip Plait) writes:

> 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

> Incidentally, if you are looking for the element numbers
> of where a = NaN, try:

> IDL> print,where(a-a ne 0)
> 2 4

Isn't it simpler (and faster) to say

IDL> print,where(a ne a)

William Thompson

Report message to a moderator

[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

Previous Topic:	Re: Center of mass???
Next Topic:	Re: contour plots on walls of a cube

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:03:34 PDT 2025

Total time taken to generate the page: 0.00418 seconds