Find the indeces of common elements of

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pietro
pietro 2015-11-2
评论： pietro 2015-11-5
Hi all,
I have two vectors and I need to find the index of the common elements between the two vectors, but the position of the indeces should be like the first array.
Here an example:
a=[7 10 33];
b=[33 7];
result=[3,1];
I would use setdiff like [C,ia] = setdiff(A,B,'stable'), but C has the same order of array A and I cannot swap A with B. In my case all the elements of B are always included in A.
Thank you
Regards
Pietro

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采纳的回答

Stephen23
Stephen23 2015-11-2
编辑：Stephen23 2015-11-2
You can use bsxfun quite effectively for this:
>> a = [7,10,33];
>> b = [33,7];
>> [R,~] = find(bsxfun(@eq,a(:),b))
R =
3
1

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