#16598: New empty design classes for a better user interface and new
is_group_divisible_design Cython function
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Reporter: ncohen | Owner: ncohen
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.3
Component: combinatorial | Resolution:
designs | Merged in:
Keywords: | Reviewers:
Authors: Nathann Cohen | Work issues:
Report Upstream: N/A | Commit:
Branch: | 1a9ae44eb163fd218e592c47ecb49a87cb7741d2
u/vdelecroix/16598 | Stopgaps:
Dependencies: #16553, #16766 |
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Comment (by vdelecroix):
Replying to [comment:44 ncohen]:
> Yoooooooo !!
>
> > There is still a subtle issue. When we ask for a relabeling we do not
necessarily want to relabel the points. More precisely, if the ground set
is {0,1,2,3} and I want to relabel {0:1, 1:3, 2:1, 3:0} I would like the
ground set to be fixed and the blocks to be changed... what do you think?
>
> I don't understand. You are just relabeling with the same ground sets,
what's the problem with that ? And how does that badly affect the blocks ?
Some will change, some will not, what's the problem ?
{{{
sage: I = IncidenceStructure(4,[[0,1,2],[1,3]])
sage: I.ground_set()
[0, 1, 2, 3]
sage: I.relabel({0:3,1:2,2:1,3:0})
sage: I.ground_set()
[3, 2, 1, 0]
}}}
the ground set has changed...
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/16598#comment:47>
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