#18972: twographs and Seidel switching
-------------------------------------+-------------------------------------
Reporter: dimpase | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: graph theory | Resolution:
Keywords: | Merged in:
Authors: | Reviewers: Nathann Cohen
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/dimpase/seidelsw | 25eec1b6d18bb021eccd4b04774111097ff8f3b5
Dependencies: #18960, #18948, | Stopgaps:
#18988, #18991, #18986, #19018, |
#19019 |
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Comment (by ncohen):
> well, `designs.TAB` gives
> {{{
> <lots of things>
> }}}
>
> Quite a few of them added by you, right?
Yes. I am quite proud of that.
> Why do you ask me to make `TwoGraph` a second-class citizen then?
No. I asked you to *not make it appear in the catalog*, in the same way
that you do not see the following classes (that I also created):
`BalancedIncompleteBlockDesign`, `GroupDivisibleDesign`,
`PairwiseBalancedDesign`.
Catalogs are not meant to hold generic class constructors (you don't see
Graph in 'graphs.' or 'PermutationGroup' in `group.`, but only functions
meant to return a "famous object". That's what catalogs are for. And
'TwoGraph', like 'BalancedIncompleteBlockDesign', is to be instanciated
with a list of blocks (like `IncidenceStructure` or
`BalancedIncompleteBlockDesign` while orthogonal arrays (which appear in
`designs.<tab>` are created from a pair of integers.
I mean. That's what catalogs are supposed to hold. You have `matrix.ones`
gut not `matrix.Matrix`.
Nathann
--
Ticket URL: <http://trac.sagemath.org/ticket/18972#comment:118>
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