[Numpy-discussion] buggy buggy bugyy: format and casting ==> BUG in numpy.sum?
Sven Schreiber
svetosch at gmx.net
Mon Sep 18 05:20:49 CDT 2006
Eric Emsellem schrieb:
> Hi again
>
> after some hours of debugging I finally (I think) found the problem:
>
> numpy.sum([[0,1,2],[2,3,4]])
> 24
>
> numpy.sum([[0,1,2],[2,3,4]],axis=0)
> array([2, 4, 6])
>
> numpy.sum([[0,1,2],[2,3,4]],axis=1)
> array([3, 9])
>
>
> Isn't the first line supposed to act as with "axis=0" by default (see
> help numpy.sum!)...???
> Not setting axis=0 it sums everything!
The default axis was changed recently to None (btw, which version are
you using?), see the release notes on the web. So yes, it's expected.
>
> Is that the expected behaviour or is the doc not updated? (I realise it
> may be better to force axis=.. to indicate what you need but still.. the
> example in numpy.sum help gives:
> sum([[0, 1], [0, 5]])
> array([0, 6]) which is not what it gives when you do it...)
on my 1.0b5 I also see this docstring which indeed seems obsolete. Has
it been changed since then? (And similarly for the other
functions/methods where axis arguments have changed.)
I could check the docstrings systematically and update them, but
unfortunately not before the end of this month, sorry.
cheers,
sven
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