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Re: Array intersections [message #11162 is a reply to message #11161]

Thu, 26 February 1998 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Robert Moss (mossrm@texaco.com) writes:

> I'm sure there were some clever responses to this same question
> just a few months ago, but for the life of me I cannot recall
> what they were. Here's the question:
>
> What is the most efficient way (using IDL, of course) to return
> the index at which two arrays intersect? e.g.
>
> a = [ 1B, 2B, 9B, 5B, 6B, 11B ]
> b = [ 5B, 6B ]
> idx = intersect( a, b )
> idx = 3
>
> This is a highly simplified example, but the point is that I want
> a function that will accept two array inputs (byte arrays in my specific
> case) and return to me the index in array a where the subset b starts.
>
> Refresh my memory, please.

You can find the clever responses on my web page at:

http://www.dfanning.com/tips/set_operations.html

Cheers,

David

-----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
E-Mail: davidf@dfanning.com
Phone: 970-221-0438
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Array intersections By: J.D. Smith on Tue, 03 March 1998 00:00
		Re: Array intersections By: J.D. Smith on Tue, 10 March 1998 00:00
		Re: Array intersections By: Andy Loughe on Thu, 26 February 1998 00:00
		Re: Array intersections By: davidf on Thu, 26 February 1998 00:00

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