solution is incorrect
Not really, we need to determine the first non-zero element in each column, not row.
Matrix indexing with two vectors of indices
Remove white space from the string
Back to basics - mean of corner elements of a matrix
Flip the vector from right to left
Add offset to a signal
Remove NaN ?
A quadrant matrix
vectorization in N
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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