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Re: array handling [message #52124 is a reply to message #52123]

Sat, 06 January 2007 08:15

Brian Larsen
Messages: 270
Registered: June 2006

Senior Member

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?

Cheers,

Brian

On Jan 6, 8:01 am, David Fanning <n...@dfanning.com> wrote:
> jochem.vere...@gmail.com writes:
>> I am a newbie in IDL. Although I cannot handle the following problem, I
>> am sure for the 'Masters' this is peanuts.
>
>> The problem:
>> I wish to filter an array of redundant data in one line. This is a part
>> of the line to be filtered:
>
>> -Inf -NaN -Inf 0.542373 2.39394 2.28125
>> 0.000000 0.000000 0.000000
>> 3.21053 1.21839 0.000000 -NaN 0.967213
>> 2.03448 0.724138 0.000000 0.000000 0.000000
>> -NaN
>
>> With WHERE I can get rid of the zeros, but I dont know how to exclude
>> the '-NaN' and '-Inf'.
>
>> Any help would be most welcome,Here is an article that will help:
>
> http://www.dfanning.com/tips/check_nan.html
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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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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