[SciPy-User] faster expm

Nathaniel Smith njs@pobox....
Thu Nov 8 01:19:51 CST 2012


On 7 Nov 2012 15:58, "Alex Leach" <beamesleach@gmail.com> wrote:
>
> On Wednesday 07 Nov 2012 10:04:55 Jonathan Helmus wrote:
>
> > Alex this is some very nice work. Unfortunately I don't think the
>
> > Expokit licensed (http://www.maths.uq.edu.au/expokit/copyright) is
>
> > compatible with the BSD license SciPy uses. Specifically approval must
>
> > be obtain before commercial use. Including the package in the Topical
>
> > Software list and/or the SciPy Cookbook/SciPy Central might be prudent.
>
> >
>
> > - Jonathan Helmus
>
>
>
> (sorry, replied directly before)
>
>
>
> Hi Jonathan,
>
>
>
> Good spot about the license issue. That's a shame, but seems like the
author might give SciPy permission to use it, if asked..

Note that just asking for SciPy to have permission is insufficient. We
actually need it to allowed for use under bsd-like terms. This is because
we need to make sure that everyone who uses scipy also can use it. The
current license makes it impossible to use expokit and GPL code in the same
program, eg.

-n

>
>
> Including it as a package, documented build method, or otherwise would be
cool. If someone wants to go ahead and do that, that's fine; I don't think
I have the access rights (or the time, really) to do any of that myself.
>
>
>
> One other thing; just did a diff to see if I'd made any other changes.
Looks like I also had to edit some calls to the matvec functions. Converted
C code fails during compilation without them. Universal diff attached.
>
>
>
> Cheers,
>
> Alex
>
>
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