[Numpy-discussion] Toward release 1.0 of NumPy
Sven Schreiber
svetosch at gmx.net
Tue Apr 18 01:15:01 CDT 2006
[Sorry for the late reaction, I was on vacation.]
Tim Hochberg schrieb:
>>
> Here's my best guess as to what is going on:
> 1. There is a relatively large group of people who use Kronecker
> product as Alan does (probably the matrix as opposed to tensor math
> folks). I'm guessing it's a large group since they manage to write the
> definitions at both mathworld and planetmath.
Yes.
> 2. kron was meant to implement this.
That's what I thought, anyway.
> 2.5 People who need the other meaning of kron can just use outer, so
> no real conflict.
> 3. The implementation was either inappropriately generalized or it
> was assumed that all inputs would be matrices (and hence rank-2).
>
> Assuming 3. is correct, and I'd like to hear from people if they think
> that the behaviour in the non rank-2 cases is sensible, the next
> question is whether the behaviour in the rank-2 cases makes sense. It
> seem to, but I'm not a user of kron. If both of the preceeding are true,
> it seems like a complete fix entails the following two things:
> 1. Forbid arguments that are not rank-2. This allows all matrices,
> which is really the main target here I think.
> 2. Fix the return type issue. I have a fix for this ready to commit,
> but I want to figure out the first part as well.
>
Both 1 and 2 sound very good to me as a user.
So, should I still submit a new ticket about kron, or is it already
being fixed?
Greetings,
Sven
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