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Finding Common Elements in Two Arrays [message #2111]

Wed, 01 June 1994 13:45

kucera
Messages: 7
Registered: June 1994

Junior Member

I'm looking for a quick way to compare two arrays in IDL, A and B,
and determine which elements of B are also in A,
so if:
A=[2,1,3,5,3,8,2,5]
B=[3,4,2,8,7,8]
I would get [0,2,3,5], because 3, 2, and 8 are in A as well as B.

I can do this with loops, but that takes too long for big arrays. Does anyone
have a way to do this using array functions or perhaps an external routine?
Terry Kucera
kucera@stars.gsfc.nasa.gov

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[Message index]

		Finding Common Elements in Two Arrays By: kucera on Wed, 01 June 1994 13:45
		Re: Finding Common Elements in Two Arrays By: stl on Wed, 01 June 1994 23:26
		Re: Finding Common Elements in Two Arrays By: stl on Mon, 06 June 1994 01:09
		Re: Finding Common Elements in Two Arrays By: landers on Fri, 03 June 1994 06:10
		Re: Finding Common Elements in Two Arrays By: landers on Fri, 03 June 1994 06:02
		Re: Finding Common Elements in Two Arrays By: dan on Wed, 01 June 1994 16:23
		Re: Finding common elements in two arrays By: andy on Tue, 26 July 1994 09:39

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