Faulty solution that passes the test suite due to ill-defined test criterium in tests 3 and 4: obviously, the function output and A_correct are not the same.
Distance walked 2D
Getting the indices from a vector
Make a run-length companion vector
Getting the indices from a matrice
Change the sign of even index entries of the reversed vector
Return unique values without sorting
Create a matrix from a cell
Multiply 2 numbers
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Create a vector whose elements depend on the previous element
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