Back and Forth Rows
Find state names that start with the letter N
Distance walked 2D
Given a 4x4 matrix, swap the two middle columns
First non-zero element in each column
Matrix which contains the values of an other matrix A at the given locations.
Remove NaN ?
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
A quadrant matrix
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