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
Remove NaN ?
Specific Element Count
check if a number is odd or even. Return 1 if it's odd, otherwise 0
check if a number is odd
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