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
Energy of a photon
Get the length of a given vector
Calculate the height of an object dropped from the sky
Create matrix of replicated elements
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