Relative occurance of intersect values

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Gabriel Stanley
Gabriel Stanley 2022-9-20
评论： Star Strider 2022-9-22
Is there a way to vectorize the below, and/or a better way to go about it?
A = %some set of numbers
B = %another set of numbers
C = intersect(A,B);
for temp = 1:numel(C)
C(temp,2) = numel(find(A==C(temp,1)));
C(temp,3) = numel(find(B==C(temp,1)));
end
I've tried using histcounts(A,C), however that returned 1 fewer bins that required, and just adding an arbitrary additional bin edge to either side does not get histcounts to give me what I'm looking for.

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Star Strider
Star Strider 2022-9-20
The intersect funciton can output the indices of the intersecting elements. See Intersection of Two Vectors and Their Indices for an illustration.
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Gabriel Stanley
Gabriel Stanley 2022-9-22
Well, I ended up rewriting my code in such a way that ismember has been very useful as the index map. Thanks!
A = [unique(A(:,1)), accumarray(findgroups(A(:,1)),A(:,2),[],@func)]
B = [unique(B(:,1)), accumarray(findgroups(B(:,1)),B(:,2),[],@func)]
C = intersect(A(:,1),B(:,1))
A2Bmap = ismember(A(:,1),C)
B2Amap = ismember(B(:,1),C)
%more code

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