Is 'mod' working correctly?
user=> (map #(mod % 3) (range -9 9))
(3 1 2 3 1 2 3 1 2 0 1 2 0 1 2 0 1 2)
It disagrees with, for example, Ruby:
irb(main):002:0> (-9..9).map{|x| x % 3}
=> [0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0]
And python:
>>> map( lambda x: x % 3, range(-9,9) )
[0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2]
--Chouser
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