[Numpy-discussion] Bug in logaddexp2.reduce

Charles R Harris charlesr.harris@gmail....
Thu Apr 1 00:17:08 CDT 2010


On Wed, Mar 31, 2010 at 6:08 PM, <josef.pktd@gmail.com> wrote:

> On Wed, Mar 31, 2010 at 7:37 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.
>
>
>
> >>> np.logaddexp2(-0.5849625007211563, -53.584962500721154)
> nan
> >>> np.logaddexp2(-1.5849625007211563, -53.584962500721154)
> -1.5849625007211561
>
> >>> np.version.version
> '1.4.0'
>
> WindowsXP 32
>
>
What compiler? Mingw?

Chuck
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