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 the vowels
Find the maximum number of decimal places in a set of numbers
Generate N equally spaced intervals between -L and L
Magic is simple (for beginners)
Given a 4x4 matrix, swap the two middle columns
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