Distance walked 2D
Spot the outlier
Make a run-length companion vector
Length of the hypotenuse
Back to basics - mean of corner elements of a matrix
Duplicate each element of a vector.
vectorization in N
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
First non-zero element in each column
Create a matrix X, where each column is a shifted copy of the vector v
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