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Re: Vector comparison. [message #37128 is a reply to message #37126]

Wed, 19 November 2003 15:48

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"hunter" <elhunter@rci.rutgers.edu> writes:

> Hello,
>
> These seems to be a fairly simple problem but I'm having difficulty coming
> up with an elegant solution.
>
> Let's say I have two vectors of type integer:
>
> A=[0,1,3,3,3,6,7,9,9]
> B=[3,7]
>
> I would like to design a function which returns the indices of all the
> elements of A which appear in B.

Now and again this question comes up. I trot out my own personal
solution, which is CMSET_OP, which finds the intersection between two
sets (appearing in both A and B):

c = cmset_op(a, 'AND', b, /index)

There are no loops.

Good luck,
Craig

P.S. Please see
http://cow.physics.wisc.edu/~craigm/idl/idl.html (under array/set ops)

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: Vector comparison. By: JD Smith on Thu, 20 November 2003 11:38
		Re: Vector comparison. By: tam on Thu, 20 November 2003 10:55
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 09:55
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 09:35
		Re: Vector comparison. By: tam on Thu, 20 November 2003 09:24
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:52
		Re: Vector comparison. By: Chris[1] on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 08:08
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 07:11
		Re: Vector comparison. By: tam on Thu, 20 November 2003 07:03
		Re: Vector comparison. By: hunter on Thu, 20 November 2003 06:49
		Re: Vector comparison. By: David Fanning on Thu, 20 November 2003 05:40
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 04:02
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 02:19
		Re: Vector comparison. By: Chris Lee on Thu, 20 November 2003 02:09
		Re: Vector comparison. By: R.Bauer on Thu, 20 November 2003 01:01
		Re: Vector comparison. By: Craig Markwardt on Thu, 20 November 2003 00:23
		Re: Vector comparison. By: David Fanning on Wed, 19 November 2003 18:05
		Re: Vector comparison. By: R.Bauer on Wed, 19 November 2003 17:50
		Re: Vector comparison. By: Craig Markwardt on Wed, 19 November 2003 15:48
		Re: Vector comparison. By: Pavel Romashkin on Wed, 19 November 2003 16:09

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