numpy: handling float('NaN') different in XP vs. Linux

John Machin sjmachin at lexicon.net
Sat Jun 14 09:58:14 CEST 2008


On Jun 14, 3:33 pm, "John [H2O]" <washa... at gmail.com> wrote:
> John Machin wrote:
>
> > Avoid impolite astonishment; RTFloatingM instead:
> > """
>
> > HTH,
> > John
> > --
>
> I guess the key here is that it is not an issue with Python, but C... can I
> change 'the underlying C code?'

The underlying C code for the Windows C RTL is probably on a server in
a bunker in Redmond WA ... good luck :-)

Perhaps you could start lashing up something along the lines that Dan
mentioned, e.g.

floated = {
   'NaN': 1e1000 / 1e1000,
   'Inf': whatever,
   }.get

def myfloat(s):
   try:
      return float(s)
   except:
      value = floated(s)
      if value is not None:
          raise
      return value

Then when/if your mapping has enough entries to make it worthwhile,
you could maybe suggest that this be done in Numpy or in the Python
core.

Cheers,
John



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