Problem 1882. Upper triangular matrix
Create a function to retrieve the upper triangular matrix of a matrix (without using tril). The matrix will always be square.
Example
If a =
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
then y =
1 2 3 4 0 6 7 8 0 0 11 12 0 0 0 16
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