For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
1 2 3 4
5 6 7 8
8 10 12 -2
-1 -3 -5 -7
Most nonzero elements in row
Implement a ROT13 cipher
Back to basics 1 - Saving
Energy of a photon
Basic commands - rounding
Nth root of a number
Basic matrix operations using standard MATLAB commands
surface areas of a cylinder
Remove white spaces at the end of the input string
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