Problem #2 has a missing right bracket on y_correct.
The test suite has been fixed.
solution test 2 has mistake
y_correct = [-1 -1 -1 -2 -2 -2 -2 5 5 5 5 5 ;
there should be ] at the end
Convert a numerical matrix into a cell array of strings
Determine Whether an array is empty
Duplicate each element of a vector.
Generate a vector like 1,2,2,3,3,3,4,4,4,4
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