[SciPy-user] nan puzzle
Robert Kern
rkern at ucsd.edu
Tue Jul 12 22:04:22 EDT 2005
Alan G Isaac wrote:
> Is this expected behavior?
> Thank you,
> Alan Isaac
>
>>>>z=[0,1,nan]
>>>>x=nan
>>>>x
>
> -1.#IND
>
>>>>x is nan
>
> True
>
>>>>x=z[2]
>>>>x
>
> -1.#IND
>
>>>>x is nan
>
> False
Platform-dependent accident, as Tim Peters is fond of saying.
On my Powerbook:
In [1]: z = [0, 1, nan]
In [2]: x = nan
In [3]: x is nan
Out[3]: True
In [4]: z[2] is nan
Out[4]: True
In [5]: x = z[2]
In [6]: x is nan
Out[6]: True
--
Robert Kern
rkern at ucsd.edu
"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter
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