#19661: the srgs from Cossidente and Penttila construction of hemisystems in
H(3,q^2)
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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: | 7c0aac76d2b66a2d481773dae7e0e7b2177cd6be
Report Upstream: N/A | Stopgaps:
Branch: |
public/19661b |
Dependencies: |
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Comment (by dimpase):
Replying to [comment:56 ncohen]:
> Considering the function, I don't think that you will detect the
difference in running time. It is probably possible, though probably a bit
ugly as we would have to catch the exception raised by GAP and check that
the error message is what we expect.
I don't actually know how to deal with creating an exception from a libgap
function returning `fail`. It can be converted to Sage's `bool` just fine,
and the previous version (in public/19661 branch) did
`bool(libgap.LoadPackage(...))` and raised an exception based on its
result. I don't know the rationale behind this changed to using
`is_package_installed`.
As a matter of fact, I don't like it. I can install a GAP package directly
into SAGE_LOCAL, and this would work with `libgap.LoadPackage(...)`, but
won't work with `is_package_installed`.
The fact that GRAPE lives in `gap_packages` at present is an unimportant
detail, and might change; what's important is that the corresponding GAP
functionality is available, and GAP surely knows better than Sage about
it.
--
Ticket URL: <http://trac.sagemath.org/ticket/19661#comment:57>
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