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Re: Select values from one array that match multiple values from an other array [message #82480 is a reply to message #82215]

Thu, 13 December 2012 08:35

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> OK, I just added a POSITIONS keyword to SetIntersection
> that will return the positions in vector A where the
> values in vector B appear.
>
> A=[1,3,2,5,2,6,1,9]
> B=[1,5]
> C = SetIntersection(a, b, Positions=pos)
> Print, pos
> 0 6 3

At Bob Stockwell's suggestion (and with his code!) I
have added the keywords INDICES_A and INDICES_B
to this program to allow you to return the matching
indices in BOTH vectors. Note that this assumes the
vectors A and B contain *unique* values. In other
words, INDICES_A and POSITIONS are identical vectors
IF vector A and B contain unique values. If they
don't, then POSITIONS will contain ALL of the locations
in vector A where the match occurs.

You can find the updated program here:

http://www.idlcoyote.com/programs/setintersection.pro

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.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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