Array comparison in Matlab

Question

Is there any built in Matlab function that can compare arrays in the following manner?

function comparison = elementcompare(array1,array2)

comparison=logical(true);
for i=1:length(array1)
    if ~any(array1(i)==array2)
        comparison=logical(false);
    end
end

This comparison, which returns true if every element of array1 can be found in array2, seems pretty basic but I was not able to find it.

Thanks!

Luis Mendo · Accepted Answer · 2014-03-29 01:24:33Z

5

The most straightforward way is to use ismember:

comparison = all(ismember(array1(:), array2(:)));

It can also be done with setdiff:

comparison = isempty(setdiff(array1(:), array2(:)));

As usual, bsxfun can do the job:

comparison = all(any(bsxfun(@eq, array1(:).', array2(:))));

Or even unique:

comparison = numel(unique([array1(:); array2(:)]))==numel(unique(array2(:)));

edited Mar 29, 2014 at 1:24

answered Mar 28, 2014 at 23:22

Luis Mendo

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