Since matlab has so many different ways of representing the empty set, could you test for emptiness using isempty(...) rather than isequal(, ...) ?
Test suit # 4 should not compare out =  with output of the function but rather isempty(out) !!!
This cody problem is really nice. At first, I felt difficult to solve it without for or while. After that, I reached to a solution.
[n, bin] = histc(A, unique(A));
multiple = find(n ==1);
index = find(ismember(bin, multiple));
failed for 4 test suit help me
>> A = 1;A(1)=;size(A)
Connect Four Win Checker
Equal to their cube
Is it a number?
Finding neighbors of [-1:1] in a matrix....
Solving Quadratic Equations (Version 1)
Diagonal of a Spiral Matrix
row-th maximum row elements
Graph Algorithms - 1 : Length of the largest closed path
longest common substring : Skipped character version
BLOCK x3 (Version 2)
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