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On Sat, Jul 6, 2013 at 12:07 PM, Jose Torre-Bueno <> wrote:
> I am not understanding what is wrong with using nan as a place holder

> n1=0/0
> n2=0/0
> print (n1, n2, n1==n2, n1==n1)
-nan    -nan    false   false

how do you use a placeholder that can't be equal to anything, not even
to itself?