matlab - How do I find the indices of a given array A1, *any* of whose values are practically equivalent to *any* of the values of a second array A2?

Question

By "practically equivalent", I mean that their distances are of order epsilon apart (or 0.000001). Equality in MATLAB often doesn't really work for long floating numbers.

If I simply do abs(A1 - A2) < 0.000001, it's not going to work since size(A1) != size(A2)

Answer 1

You can get the answer by calculating distance between two vectors using MATLAB's pdist2 function.

dist=pdist2(A1,A2);
minDist=min(dist,[],2);
indices_A1=minDist<=0.000001;
desired_A1=A1(indices_A1);

Not tested, but should work.