[Numpy-discussion] Error in choose (bug?)

Todd Miller jmiller at stsci.edu
Thu May 13 09:58:07 CDT 2004


On Thu, 2004-05-13 at 07:13, Álvaro Tejero Cantero wrote:
> I have a matrix of particle collision times: times[i,j] gives the time
> for particle "i" to collide with particle "j".
> 
> If I do, in order to get the first expected collision time for each
> particle, the following (random array for testing purposes)	:
> 
> >>> N=30
> >>> times = rnd.random([N,N])
> >>> choose(argmin(times,transpose(times))
> Segmentation fault (of the python interactive shell!!!)
> 
> With N=100 I get a more informative traceback, and rest within the
> shell:
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "/usr/lib/python2.3/site-packages/numarray/ufunc.py", line 1670, in choose
>     return _choose(selector, population, outarr, clipmode)
>   File "/usr/lib/python2.3/site-packages/numarray/ufunc.py", line 1579, in __call__
>     result = self._doit(computation_mode, woutarr, cfunc, ufargs, 0)
>   File "/usr/lib/python2.3/site-packages/numarray/ufunc.py", line 1564, in _doit
>     blockingparameters)
> ValueError: _operator_compute: too many inputs + outputs
> 
> 
> For N=10,N=15 I get the expected output, but for N=20 I get again the
> brutal segfault...
> 
> 
> regards, 
> á.

I was able to reproduce this bug, logged it on Source Forge, and will
get to it as soon as possible... probably tomorrow or Monday.

Regards,
Todd







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