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

A simple approach is to use bsxfun to test for equality between each element of A and B:

ind = bsxfun(@eq, A(:), B(:).');
list = cellfun(@find, mat2cell(ind, ones(1,numel(A)), numel(B)), 'uni', 0);

The matrix ind gives the result in logical form (i.e. 0 or 1 values), and list is a cell array containing the indices:

>>  ind

ind =

     0     0     0     0     0     0
     0     0     0     0     0     0
     0     1     1     1     0     0
     1     0     0     0     0     0

>> celldisp(list)

list{1} =

     []


list{2} =

     []    

list{3} =

     2     3     4

list{4} =

     1