Find the numeric mean of the prime numbers in a matrix.
Remove any row in which a NaN appears
Create a square matrix of zeros of even order
Is it column vector?
Generate a vector which contains a pyramid pattern (★★★★)
Vector of digits (★★)
Average of corner elements of a matrix (★★)
Create a vector of n alternating ones and minus ones (★★)
Make a checkerboard matrix (★★★★★)
Element-wise vector product (★)
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