Given a 2D array of ones and zeros, generate an equivalent sized checkerboard array of ones and twos. The checkerboard pattern starts with 2:
Then set this checkerboard array to zero wherever the original was zero.
You should add a test case where the last row and/or last column of x contains only zeroes.
Longest Divisor Run
Omit columns averages from a matrix
Set some matrix elements to zero
Add more zeros
Is it an Armstrong number?
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