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.
Getting the indices from a vector
Getting the indices from a matrice
Return area of square
Replace every 3rd element in a vector with 4
average for three points
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