This Test suite sucks.. it does not let pass a right solution.........
The test suite does not check that y has n elements.
Make a checkerboard matrix
Back to basics 15 - Benchmark
Return the first and last characters of a character array
Find number of days
Operate on matrices of unequal, yet similar, size
Make a KITT-scanner on the command line
Create a random vector of integers with given sum
Wrap a vector, but insert NaN's at the wrap-positions.
Only once: cleaning up your columns
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