Back to basics 25 - Valid variable names
Get all prime factors
Make an identity matrix whose diagonal elements are 1:n
Product of all elements in an array
basic matrix operations: rotate and find sum of diagonal elements of the resultant matrix
Percentage of zeros in a matrix of only 1s and 0s
Repetition of matrices
Find NaNs in the matrix
Raise each element to the power of its index in a matrix
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