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
Right and wrong
Given a 4x4 matrix, swap the two middle columns
Divide by 4
Create a Matrix of Zeros
NaN (欠損値) が含まれている行を削除しよう
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