solution is incorrect
Not really, we need to determine the first non-zero element in each column, not row.
Increment a number, given its digits
Is this matrix orthogonal?
Set the array elements whose value is 13 to 0
A quadrant matrix
Duplicate each element of a vector.
Matrix with different incremental runs
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
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