On Jan 17, 11:39 am, Robert Bradshaw <[EMAIL PROTECTED]>
wrote:
Hello,
> transform.pyx does some maxima stuff, perhaps the patch (or some
> combination with other patches) is leaving maxima in an unstable state?
I consider this the most likely culprit, but I am not familiar with
the maxima interface, so somebody else needs to debug this. I can't
wait for sympy to step up and at least do symbolic matrices. Ondrej?
> - Robert
>
> On Jan 17, 2008, at 1:46 AM, Simon King wrote:
>
> > Hi Michael,
>
> > since i was partially involved in that patch, i'd like to know what
> > happened.
>
> > On Jan 17, 4:32 am, mabshoff <[EMAIL PROTECTED]
> > dortmund.de> wrote:
> >> I am as surprised as you are that this patch causes problems. What
> >> happens is that when doctesting plot/plot3d/transform.pyx it just
> >> hangs.
>
> > What does transform.pyx do? Does it hang since it computes some
> > modular invariant ring? This might be not a surprize: Singular is much
> > faster than Magma in computing *non*-modular invariant rings, but
> > Magma is much faster in *modular* invariant rings.
>
> > Or is plot/plot3d/transform.pyx doing something completely different,
> > so that it seems there is an odd side-effect?
>
> >> The patch itself did get applied correctly and I don't
> >> see how it could interfere, but it does. Since maxima is involved in
> >> this doctest I will leave this for somebody else who is more familiar
> >> with that subsystem to debug.
>
> > Perhaps this is related to something that i met a while ago. I had
> > some computation involving occasionally some logarithms. When i
> > repeated the *same* computation very often, the computation time for
> > each run dramatically increased. That's to say: If t is the time for
> > the first run of the computation, then the time for run number 100 has
> > been 20*t or so. A closer inspection showed that this increase only
> > concerned Maxima computations. I'll try to reproduce that phenomenon.
I remember the issue, but the doctest just sits there at 0% CPU for
hours, so I don't think it is that problem. Most likely as Robert
suggested above it is a synchronization issue with the Maxima
interface.
The interesting question: Can anybody reproduce this with 2.10.alpha4
+ the bundle from #1485 applied?
> > Yours
> > Simon
Cheers,
Michael
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