[Numpy-discussion] major bug in fromstring, ascii mode

[Gabriel J.L. Beckers]

Doesn't work here:

In [1]: import numpy as npy

In [2]: npy.fromstring('23:09:01', dtype=int, sep=':')
Out[2]: array([23,  0])

In [3]: npy.__version__
Out[3]: '1.0.5.dev4722'

In [4]: npy.fromstring('23:09:01', dtype=int, sep=':', count=3)
Out[4]: array([       23,         0, 151904160])

...

Pentium Dual Core, Ubuntu Linux 7.10, I have both gcc-3.4 and gcc-4.1 on
my system; don't know which one the setup.py uses. Default is 4.1.3 

Gabriel


On Sun, 2008-01-27 at 01:16 -0700, Charles R Harris wrote:
> 
> 
> On Jan 26, 2008 11:30 PM, Eric Firing <efiring at hawaii.edu> wrote:
>         In the course of trying to parse ascii times, I ran into a
>         puzzling bug.
>          Sometimes it works as expected:
>         
>         In [31]:npy.fromstring('23:19:01', dtype=int, sep=':')
>         Out[31]:array([23, 19,  1])
>         
>         But sometimes it doesn't:
>         
>         In [32]:npy.fromstring('23:09:01', dtype=int, sep=':')
>         Out[32]:array([23,  0])
>         
>         In [33]:npy.__version__
>         Out[33]:'1.0.5.dev4742'
> 
> Works here.
> 
> In [6]: for i in range(100):fromstring('23:19:01', dtype=int, sep=':')
> 
> In [7]: numpy.__version__
> Out[7]: '1.0.5.dev4730'
> 
> 
> produces no failures. The fact that it fails for you sometimes and not
> others is very odd. It's like some sort of bizarre race condition or
> bit flip. What architecture/OS/compiler are you using? Have you tested
> memory?
> 
> Chuck
>  
> 
>         
>         In [34]:npy.fromstring('23:09:01', dtype=int, sep=':',
>         count=3)
>         Out[34]:array([23,  0, 16])
>         
>         In [35]:npy.fromstring('23 09 01', dtype=int, sep=' ',
>         count=3)
>         Out[35]:array([23,  0,  9])
>         
>         In [36]:npy.fromstring('23 09 01', dtype=int, sep=' ')
>         Out[36]:array([23,  0,  9,  1])
>         
>         Maybe it is a problem specific to int conversion; examples
>         that fail
>         with int work with float:
>         
>         In [37]:npy.fromstring('23 09 01', dtype=float, sep=' ')
>         Out[37]:array([ 23.,   9.,   1.])
>         
>         In [38]:npy.fromstring('23:09:01', dtype=float, sep=':')
>         Out[38]:array([ 23.,   9.,   1.])
>         
>         
>         Eric
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-- 
Dr. Gabriël J.L. Beckers

Max Planck Institute for Ornithology
Group Neurobiology of Behaviour
Postfach 1564, 82305 Starnberg, Germany

Web: http://www.gbeckers.nl
Phone: +49-8157932273, Fax: +49-8157932285