Given the matrix M, return M without the external frame.
Additional test cases have been added.
Back and Forth Rows
Remove any row in which a NaN appears
Replace NaNs with the number that appears to its left in the row.
Back to basics 26 - Keywords
03 - Matrix Variables 1
Inverse of Hilbert matrix
Distance of the centroids of the balls
Find the function
Find the function 2
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