Given an array, return the cumulative difference.
a = [ 1 3 5 7 ]
cumdiff = [ 1 2 1 -2 ]
Make a checkerboard matrix
Back to basics 8 - Matrix Diagonals
peta to nano (x-ray)
Sum of diagonals elements of a matrix
Matrix multiplication across rows
Matrix to column conversion
Find offset of an element of a multi dimensional matrix
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