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How to get matching elements of array efficiently [message #69934]

Tue, 23 February 2010 12:11

JJ
Messages: 36
Registered: January 2007

Member

Hi All,

I'm looking for an efficient (non-loop) solution to this problem. I
have two arrays A, B. The elements of A are not necessarily unique,
nor is A necessarily sorted. I'd like to find all the indices in A
that match values that occur in B.

For example, if A = [7,1,8,7,8], B = [7,8], the result should be
[0,2,3,4].

A and B can have many (order millions) of unique values, so I'd rather
avoid a loop if I can.

Is there any way to do this efficiently?

Thanks.

-JJ

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