#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: u/ncohen/16598 | ea8b144f5dd28d40102e5ccb06edab716951867a
Dependencies: #16553 | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:37 ncohen]:
> YOoooooooo !
>
> > 1) There is a problem with your `relabel` method
>
> Gloops. Sorry 'bout that `:-/`
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?
> > 3) This is very bad
> > {{{
> > round(sqrt(len(blocks)))
> > }}}
> > (i.e. it involves the symbolic ring).
>
> Is it bad to involve the symbolic ring ? `O_o`
Yes: SR is very slow and unreliable (though for sqrt of integers it should
be ok).
Vincent
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Ticket URL: <http://trac.sagemath.org/ticket/16598#comment:42>
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