Remove the polynomials that have positive real elements of their roots.
Least common multiple of many numbers
Project Euler: Problem 5, Smallest multiple
Getting the indices from a matrice
First non-zero element in each column
Remove NaN ?
Find the elements of a matrix according to a defined property.
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
vectorization in N
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