MATLAB: Row wise output for find(ismember(Values, searchValues,’rows’))

Question

I have two matrices say foo and bah as follows:

>> foo =

     2    19
     5    68
    17    19
    65    37
    73    62
    65    78
    45     9
    55    93
    30    77
    74    49

>> bah

bah =

     5    68
    65    78
    65    78
    55    93
    55    93
    55    93
    55    93

To get the indices, I am doing:

>> find(ismember(foo,bah,'rows'))

ans =

     2
     6
     8

I want the answer as:

     2
     6
     6
     8
     8
     8
     8

corresponding to each row of the bah matrix. How do I get such an output?? I tried using bsxfun/arrayfun/isequal/intersect?! Unique will just make it more difficult to map it back!

Please help! I really want to avoid a for loop here to go through each row and want a smarter way to do it!

Thanks! 🙂

Alpa.

Answer 1

Alpa:

Try using all return arguments of ismember():

[~, rows] = ismember(bah, foo,'rows')