[Numpy-discussion] kron bug with zero-length dimensions?

Bill Baxter wbaxter at gmail.com
Sat Jan 27 19:52:24 CST 2007


Theres also numpy.tile which is like a repmat generalized to N-dim.
--bb

On 1/27/07, Sven Schreiber <svetosch at gmx.net> wrote:
> Sven Schreiber schrieb:
> > Hi,
> >
> > the kron(a,b) function seems to allow shapes such as (0,x) or (y,0) only
> > for the second argument b, not for the first argument a. (See below for
> > examples.)
> >
> > Maybe it's too harsh to call it a bug because the result is typically
> > not defined mathematically. But then why differentiate between allowing
> > those things for b (very useful), but not for a (thus requiring
> > workarounds.)
> >
> >
>
> Well in the meantime I learned several things;
>
> for my particular problem matlib.repmat is better suited than kron
> anyway (note that repmat isn't mentioned yet in the numpy book),
>
> and "zero-length dimensions" may not be the accurate term in numpy-speak
> (would zero-length axis be ok?),
>
> however I still haven't learned the reason for kron's partial limitation
> described above... any insights on this?
>
> thanks again,
> sven
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