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
Tell me the slope
Inner product of two vectors
Back to basics 23 - Triangular matrix
Back to basics - mean of corner elements of a matrix
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