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
Make a run-length companion vector
Switch matrix to a column vector
Remove white spaces at the end of the input string
count upper and lower case characters
Return median of a matrix
Percentage of zeros in a matrix of only 1s and 0s
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