Charles R Harris
Mon Mar 26 18:07:52 CDT 2007
On 3/26/07, Travis Oliphant <email@example.com> wrote:
> Charles R Harris wrote:
> > The rule 1-d is always a *row* vector only applies when converting
> > to a
> > matrix.
> > In this case, the dot operator does not "convert to a matrix" but
> > uses
> > rules for operating with mixed 2-d and 1-d arrays inherited from
> > Numeric.
> > I'm very hesitant to change those rules.
> > I wasn't suggesting that, just noticing that the rule was 1-d vector
> > on right is treated as a column vector by dot, which is why an
> > exception was raised in the posted case. If it is traditional for
> > matrix routines always treat is as a row vector, so be it.
> O.K. So, the problem is that when I defined matrix multiplication, I
> mistakenly believed that dot always interpreted 1-d arrays as row
> vectors which it is now clear it doesn't.
> I think this led to the issues.
> So, making dot always return arrays seems like the needed fix.
Sounds good. Do you want to leave the matrix * operator as it now is?
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