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Re: array handling [message #52123 is a reply to message #52122]

Sat, 06 January 2007 08:39

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

Brian Larsen wrote:
> Something I have always wondered is the difference between using
> finite() and just using ne?
>
> As an example:
> IDL> array = [ 1.0, 2.0, !Values.F_NAN, 4.0, !Values.F_NAN ]
> IDL> Print, Where( NOT Float( Finite(array) ) )
> 2 4
> IDL> print, where(array ne array)
> 2 4
>
> What is the fundamental difference here? Speed? Style? or something
> else entirely?

One thing is that FINITE can handle NaN's and infinity all in one step.

By the way, it took me a second to figure out why you were converting to
float in the FINITE example. Maybe

IDL> print, where(~finite(array))

would be better since FINITE returns only 0's and 1's (as long as you
have IDL 6.0+)?

Mike
--
www.michaelgalloy.com

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[Message index]

		Re: array handling By: news.qwest.net on Mon, 08 January 2007 09:43
		Re: array handling By: David Fanning on Sat, 06 January 2007 08:51
		Re: array handling By: David Fanning on Sat, 06 January 2007 08:47
		Re: array handling By: Michael Galloy on Sat, 06 January 2007 08:39
		Re: array handling By: Brian Larsen on Sat, 06 January 2007 08:15
		Re: array handling By: David Fanning on Sat, 06 January 2007 07:01
		Re: array handling By: Brian Larsen on Thu, 11 January 2007 07:27

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