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Re: Select values from one array that match multiple values from an other array [message #82217 is a reply to message #82216]

Fri, 30 November 2012 07:31

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

PMagdon writes:

> I tried to use WHERE for multiple comparisons of two arrays.
>
> Here is a minimal example:
>
> 1.) Two arrays
>
> A=[1,3,2,5,2,6,1,9]
> B=[1,5]
>
> 2.) I need to extract all positions of A where any of the values from B occur in A. So that C should look like this:
>
> C=[0,3,6]
>
> So far I tested
> C=WHERE(A EQ B) but this doesn't work.
>
> Any ideas how to solve that without looping over B?

c = SetIntersection(a, b)

http://www.idlcoyote.com/tips/set_operations.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 thue. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Select values from one array that match multiple values from an other array By: Craig Markwardt on Fri, 30 November 2012 08:32
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 08:22
		Re: Select values from one array that match multiple values from an other array By: PMagdon on Fri, 30 November 2012 08:13
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 07:57
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 07:36
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Fri, 30 November 2012 07:31
		Re: Select values from one array that match multiple values from an other array By: David Fanning on Thu, 13 December 2012 08:35

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