[Numpy-discussion] Broadcasting rules (Ticket 76).

Keith Goodman kwgoodman at gmail.com
Thu Apr 27 11:05:03 CDT 2006


On 4/27/06, Sasha <ndarray at mac.com> wrote:
> On 4/27/06, Keith Goodman <kwgoodman at gmail.com> wrote:
> > [...]
> > In Octave or Matlab, all you need to do is sum(x,1). For example:
> >
> > >> x = rand(1,4)
> > x =
> >
> >   0.56755  0.24575  0.53804  0.36521
> >
> > >> sum(x,1)
> > ans =
> >
> >   0.56755  0.24575  0.53804  0.36521
> >
>
> How is this different from Numpy:
>
> >>> x = matrix(rand(4))
> >>> sum(x.T, 1)
> matrix([[ 0.36186805],
>        [ 0.90198107],
>        [ 0.60407661],
>        [ 0.49523327]])
>

Exactly. That's why the OP doesn't need to write a special function in
Matlab called SumColumns.




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