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)
Times 2 - START HERE
Find the longest sequence of 1's in a binary sequence.
Find the "ordinary" or Euclidean distance between A and Z
Derivative of polynomial
Wind Chill Computation
Graph Algorithms 3: Number of Connected Components
Collaborative Fun : Nomination
BLOCK x3 (Version 2)
Graph Algorithms - 1 : Length of the largest closed path
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