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
Test for balanced parentheses
vectorization in N
Return 'on' or 'off'
Reverse a matrix
Remove white spaces at the end of the input string
find number of times of occurrence of the most frequent number in a row vector
Basic matrix operations using standard MATLAB commands
Basics: counting digits of a number irrespective of the sign
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