Unfold a 2-D matrix to a 1-D array in zig-zag order, e.g., for matrix
[ 1 2 3 ;
4 5 6 ;
7 8 9 ]
the resulting 1-D array should be
[ 1 2 4 7 5 3 6 8 9 ]
Find the numeric mean of the prime numbers in a matrix.
Remove any row in which a NaN appears
Compute a dot product of two vectors x and y
Number of digits in an integer
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