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.
Bottles of beer
First non-zero element in each column
Get the length of a given vector
Remove the two elements next to NaN value
average for three points
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