[Numpy-discussion] Python 2.2 seriously crippled for numerical computation?

Huaiyu Zhu huaiyu_zhu at yahoo.com
Fri Mar 1 21:09:02 CST 2002


There appears to be a serious bug in Python 2.2 that severely limits its
usefulness for numerical computation:

# Python 1.5.2 - 2.1

>>> 1e200**2
inf
>>> 1e-200**2
0.0

# Python 2.2

>>> 1e-200**2
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OverflowError: (34, 'Numerical result out of range')
>>> 1e200**2
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
OverflowError: (34, 'Numerical result out of range')

This produces the following serious effects: after hours of numerical
computation, just as the error is converging to zero, the whole thing
suddenly unravels.

Note that try/except is completely useless for this purpose.

I hope this is unintended behavior and that there is an easy fix.
Have any of you experienced this?  


Huaiyu






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