Find the sum of the elements in the "second" diagonal
Rotate a Matrix
Determine Whether an array is empty
Convert a vector into a number
Longest run of consecutive numbers
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
A quadrant matrix
vectorization in N
Matrix with different incremental runs
Matrix which contains the values of an other matrix A at the given locations.
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