[SciPy-user] Re: nan puzzle
Alan G Isaac
aisaac at american.edu
Wed Jul 13 11:18:11 CDT 2005
On Wed, 13 Jul 2005, Grant Edwards apparently wrote:
> What you probably want to be checking is if x has a nan
> value, not whether x is the same object as some other
> object that has a nan value.
How? (See below.)
Anyway, now I cannot replicate the problem.
I did post a cut and paste, but I cannot reproduce it.
Also I recall having to type something that did not come
with the cut, so the post must be suspect until I can
replicate. I'll repost if I find can.
Until then, sorry for the noise.
I'll plan on using isnan().
Thanks for the feedback.
Alan
Python 2.3.3 (#51, Dec 18 2003, 20:22:39) [MSC v.1200 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from scipy import *
>>> x=nan
>>> x is nan
True
>>> isnan(x)
1
>>> x == nan
False
>>> z = [0,1,nan,3]
>>> z[2] is nan
True
>>> x = z[2]
>>> x is nan
True
>>>
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