Given a vector x, return vector y with all negative elements from the vector x if x has negative elements. Otherwise return 0.
for example: x=[1 2 3 4 -5 -2] y=[-5 -2]
x=[1 2 3] y=0
Find common elements in matrix rows
middleAsColumn: Return all but first and last element as a column vector
Create an n-by-n null matrix and fill with ones certain positions
Is it a number?
Sum of series II
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