Finding all indices by ismember

Question

This is what is described in one of the examples for ismember:

Define two vectors with values in common.

A = [5 3 4 2]; B = [2 4 4

Answer 1

This line will return all indices:

F=arrayfun(@(x)(find(A(x)==B)),1:numel(A),'UniformOutput',false)

Or a longer version, which might be easier to read:

F=cell(numel(A),1);
for x=1:numel(A)
  F{x}=find(A(x)==B);
end

find(A(x)==B) checks for all occurrences of A(x) in B. This is done for each element of the array, either using a for loop or arrayfun.