Additional test cases have been added.
Swap the first and last columns
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Is this triangle right-angled?
Matrix of almost all zeros, except for main diagonal
Find NaNs in the matrix
Return median of a matrix
Sum of unique multiples of 3 and 5
surface areas of a cylinder
find number of times of occurrence of the most frequent number in a row vector
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