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Re: Finding Common Elements in Two Arrays [message #2189 is a reply to message #2111]

Fri, 03 June 1994 06:10

landers
Messages: 45
Registered: May 1993

Member

It's me again...

Now I noticed you want the indices rather than the values.... So

In article <1994Jun3.130243.3453@mksol.dseg.ti.com>, landers@tsunami.dseg.ti.com (David Landers) writes:

|>
|> Na = N_ELEMENTS(a)
|> Nb = N_ELEMENTS(b)
|> L = LINDGEN(Na,Nb)
|> AA = A( L MOD Na )
|> BB = B( L / Na )

Then...

I = AA EQ BB
Ia = UNIQUE( I MOD Na )
Ib = UNIQUE( I / Na )

Now Ia has the indices of A that are in B, and Ib has the indices of B that
are in A. Leave off the UNIQUE if you care that an element matches multiple
times.

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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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