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Re: Select Equal elements from 2 arrays [message #60955 is a reply to message #60954]

Mon, 23 June 2008 08:32

Ryan.
Messages: 77
Registered: March 2006

Member

maffie wrote:
> Dear all,
>
> I have 2 arrays, of unequal length, who hold a number of indices that
> are referring to a location of another array.
> Now, I would like to choose these elements which appear in both arrays
> A and B.
>
> For example:
>
> A = [0,8,16,36,49]
> B =[1,8,33,36,49]
>
> result = [8,49]
>
> Isn't there a simple function to do that? I can't find anything
> although I have tried with SORT, UNIQ and WHERE??
>
> Thank you!
> Matthias
>

You can read about Union and Intersections on David Fanning's Website
here: http://www.dfanning.com/tips/set_operations.html

Or you can do this with CM_SETOP from Craig Markwardt's library here:
http://cow.physics.wisc.edu/~craigm/idl/idl.html

I've used Craig's CM_SETOP before because it can handle performing these
operations on strings.

Hope this helps,
Ryan.

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[Message index]

		Re: Select Equal elements from 2 arrays By: ianpaul.freeley on Mon, 23 June 2008 09:46
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:46
		Re: Select Equal elements from 2 arrays By: David Fanning on Mon, 23 June 2008 08:45
		Re: Select Equal elements from 2 arrays By: Ryan. on Mon, 23 June 2008 08:32
		Re: Select Equal elements from 2 arrays By: humanumbrella on Mon, 23 June 2008 08:37
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:32
		Re: Select Equal elements from 2 arrays By: humanumbrella on Mon, 23 June 2008 08:30
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:28
		Re: Select Equal elements from 2 arrays By: matthias.demuzere on Mon, 23 June 2008 08:27
		Re: Select Equal elements from 2 arrays By: humanumbrella on Mon, 23 June 2008 08:17

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