#19661: the srgs from Cossidente and Penttila construction of hemisystems in
H(3,q^2)
-------------------------+-------------------------------------------------
Reporter: | Owner:
dimpase | Status: needs_review
Type: | Milestone: sage-7.0
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers:
theory | Work issues:
Keywords: | Commit:
Authors: | 16f1f711fce54ae770c81dd957e5cad2baea8fe1
Report Upstream: N/A | Stopgaps:
Branch: |
public/19661 |
Dependencies: |
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Comment (by dimpase):
Replying to [comment:26 ncohen]:
> > I hope you don't want me to replace what I have with a sequence of
`libgap.eval...`.
>
> Ideally, you should only call Sage/libgap function and give them
Sage/gap objects as parameters. Not strings.
>
> > (Hint: `libgap.function_factory` was created for a reason...)
>
> Consequently you must use it right now, in this patch, for whatever you
want to do with it? Fuzzy logic.
Nothing fuzzy - it's the right tool for the job. You don't know a better
one, right? In fact many functions in this file would've become much
cleaner, had I known about it then...
>
> What I mean is that there are apparently some mathematical computations
tht you do not know how to perform with Sage only.
yes, I do know how to do them in Sage, in C, or on a Turing machine if I
must...
But it's suboptimal, for reasons of efficiency, and of the code length.
> If there is no way to do it in Sage directly, do you think there could
be a way to add those features to Sage (calling gap in the background)?
Well, every time I talk to you guys about a graph backend that can do
things with symmetric graphs as good as GRAPE does it in Sage, I don't
hear cheers and screams "yes, let's do it!" I rather hear "hmm, how do we
remove an edge then" or something equally compelling...
I still think it would be great for this (SRGs) project to have such a
backend. But not on this ticket...
>
> > If you really want I can move computations of e and nu over to Python.
>
> e and nu are no variables of your gap script, so I do not understand.
oops, sorry, mea maxima culpa. Fixed in the last commit.
--
Ticket URL: <http://trac.sagemath.org/ticket/19661#comment:28>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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