#16553: Clean IncidenceStructure
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Reporter: vdelecroix | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: combinatorial designs | Resolution:
Keywords: | Merged in:
Authors: Nathann Cohen, Vincent | Reviewers:
Delecroix | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by vdelecroix):
Some more remarks:
- I think we also want another bijection `blocks <-> {0, ..., b-1}` to
have well defined incidence matrices. It would also help to choose proper
labels for the dual incidence structure.
- A better name for `IncidenceStructure` would be `Design`... and we also
need a class for `GroupDivisibleDesign` and for them we need an other
bijection `groups <-> {0, ..., g-1}`.
- to fit with enumerated set the natural terminology for the bijection
would be `rank/unrank`
{{{
class Design:
def rank_point(self, point): # index of ``point``
def unrank_point(self, n): # ``n``-th point
def rank_block(self, block): # index of ``block``
def unrank_block(self, n): # ``n``-th block
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16553#comment:1>
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