[Numpy-discussion] Broadcasting rules (Ticket 76).
oliphant.travis at ieee.org
Mon Apr 24 22:00:02 CDT 2006
> On 4/24/06, Travis Oliphant <oliphant.travis at ieee.org> wrote:
> I've attached a patch to the ticket:
I don't think the patch will do your definition of "the right thing"
(i.e. mirror broadcasting behavior) in all cases. For example if "a" is
2x3x4x5 and "b" is 2x1x1x5, then a[...] = b will not fill the right
sub-space of "a" with the contents of "b".
The PyArray_CopyInto gets called in a lot of places. Have you checked
all of them to be sure that altering the semantics of copying (which are
currently different than broadcasting) will work correctly? I agree
that one can demonstrate a slight in-consistency. But, I'd rather have
the inconsistency and tell people that copying and assignment is not a
broadcasting ufunc, then feign consistency and have it not quite right.
More information about the Numpy-discussion