[Numpy-discussion] Bug in logaddexp2.reduce

David Cournapeau david@silveregg.co...
Wed Mar 31 21:02:46 CDT 2010


Ryan May wrote:
> On Wed, Mar 31, 2010 at 5:37 PM, Warren Weckesser
> <warren.weckesser@enthought.com> wrote:
>> T J wrote:
>>> On Wed, Mar 31, 2010 at 1:21 PM, Charles R Harris
>>> <charlesr.harris@gmail.com> wrote:
>>>
>>>> Looks like roundoff error.
>>>>
>>>>
>>> So this is "expected" behavior?
>>>
>>> In [1]: np.logaddexp2(-1.5849625007211563, -53.584962500721154)
>>> Out[1]: -1.5849625007211561
>>>
>>> In [2]: np.logaddexp2(-0.5849625007211563, -53.584962500721154)
>>> Out[2]: nan
>>>
>> Is any able to reproduce this?  I don't get 'nan' in either 1.4.0 or
>> 2.0.0.dev8313 (32 bit Mac OSX).  In an earlier email T J reported using
>> 1.5.0.dev8106.

Having the config.h as well as the compilation options would be most 
useful, to determine which functions are coming from the system, and 
which one are the numpy ones,

cheers,

David


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