solution is incorrect
Not really, we need to determine the first non-zero element in each column, not row.
Return the Fibonacci Sequence
Reindex a vector
Doubling elements in a vector
Create matrix of replicated elements
Duplicate a character
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Create a matrix X, where each column is a shifted copy of the vector v
A quadrant matrix
Duplicate each element of a vector.
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