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
Sum the Digits of a Number
select the primes of a vector
Is the input divisible by 3?
Sort the vector with the given index
Day counter function
Check for keywords
Find NaNs in the matrix
Remove white spaces at the end of the input string
Basic Quadratic Equation
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