#16476: New difference family (25,4,1) and cleanup in bibd.py
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Vincent Delecroix | Work issues:
Report Upstream: N/A | Commit:
Branch: | 868e0b0a40d0706e599cd60c7fedb013accbfd66
u/vdelecroix/16476 | Stopgaps:
Dependencies: #16461 |
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Comment (by vdelecroix):
Replying to [comment:5 ncohen]:
> Good to go ! I wondered about that though... Do we care ? Should we
check that the set of block sizes contains integer > 1 ?
>
> {{{
> sage: from sage.combinat.designs.bibd import _check_pbd
> sage: _check_pbd([[1],[]],1,[1,0])
> ...
> RuntimeError: This is not a nice honest PBD from the good old days!
> }}}
Actually, it would make more sense to have `is_pairwise_balanced_design`
in `designs_pyx.pyx`... and testing that blocks are non-empty certainly
needed! What do you want do be added to that ticket?
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Ticket URL: <http://trac.sagemath.org/ticket/16476#comment:6>
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