[Numpy-discussion] Toward release 1.0 of NumPy

Charles R Harris charlesr.harris at gmail.com
Thu Apr 13 05:35:13 CDT 2006


On 4/13/06, Sven Schreiber <svetosch at gmx.net> wrote:
> Travis Oliphant schrieb:
> >
> > The next release of NumPy will be 0.9.8
> >
> > The recent discussions and bug-reports have been very helpful.  If you
> > have found a bug, please report it on the Trac pages so that we don't
> > lose sight of it.
> > Report bugs by "submitting a ticket" here:
> >
> Before submitting the following as a bug, I would like to repeat what I
> posted earlier (no replies) to check whether you agree it's a bug:
> The "kron" (Kronecker product) function returns numpy-arrays even if
> both arguments are numpy-matrices; imho that's a bug in light of the
> proclaimed goal of preserving matrices where possible/sensible.

What would you do instead? The Kronecker product (aka Tensor product) of two
matrices isn't a matrix. I suppose you could make it one by appealing to the
universal property -- bilinear map on the Cartesian product of linear spaces
-> linear map on the tensor product of linear spaces -- but that seems a bit
abstract for numpy and you would need to define the indices of the resulting
object as some sort of pair.

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