Classify x data as
if x>=0 then y=1
if x<0 then y=0
x = [ -2 -1 0 1 2]
y = [ 0 0 1 1 1]
Additional test cases have been added.
Angle between two vectors
Back to basics 18 - justification
Matrix indexing with two vectors of indices
Remove the positive integers.
average for three points
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