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Re: Array comparison [message #32352 is a reply to message #32351]

Tue, 01 October 2002 19:59

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"Sean Raffuse" <sean@me.wustl.edu> writes:

> I would like to compare two arrays of different size. What I want to know
> is if the two arrays share ANY of the same values, regardless of index.
>
> e.g.
>
> Array1 = [1,2,3,4,5]
> Array2 = [5,6,7]
>
> Comparing these two arrays should return true because they both have the
> value 5.

Mike has a nice one-off comparison you can use. For your kinds of
set-comparison tests, I use CMSET_OP with an intersection test.

intersection = cmset_op(array1, 'AND', array2, count=ct)
if ct GT 0 then print, 'Arrays match'

The variable INTERSECTION contains the intersection between the two
sets. The internals of CMSET_OP are ultimately the same as Mike's
approach, but with a bit more flexibility.

Craig

http://cow.physics.wisc.edu/~craigm/idl/idl.html

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

		Re: Array comparison By: mchinand on Wed, 02 October 2002 13:44
		Re: Array comparison By: Jeff Guerber on Wed, 02 October 2002 12:04
		Re: Array comparison By: Craig Markwardt on Wed, 02 October 2002 08:12
		Re: Array comparison By: R.Bauer on Wed, 02 October 2002 08:09
		Re: Array comparison By: David Fanning on Wed, 02 October 2002 07:53
		Re: Array comparison By: Sean Raffuse on Wed, 02 October 2002 07:34
		Re: Array comparison By: Craig Markwardt on Wed, 02 October 2002 06:19
		Re: Array comparison By: R.Bauer on Wed, 02 October 2002 01:11
		Re: Array comparison By: Craig Markwardt on Tue, 01 October 2002 19:59
		Re: Array comparison By: mchinand on Tue, 01 October 2002 17:07

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