McLaughlin graph constructor

[nathanncohen]

Annnnnnnnnnnd I think that this is the last one I can steal from www.win.tue.nl/~aeb/ without help in maths ^^;

The tests are rather long, but they are not flagged with "long time". This is because they are already flagged with "optional gap_packages", and

1. I have no idea how flags should be stacked in such situations
2. with an "optional" flag the doctests will be almost never run, so let's not make it even rarer :-P

And. I computed some layouts for this graph, all of them looking like a giant black thing. That was in png. I also tried svg, and you can check at this address (if you can display it :-P) what we are missing by not adding the layout to Sage's constructor :

http://www.steinertriples.fr/10.svg
http://www.steinertriples.fr/11.svg
http://www.steinertriples.fr/26.svg

Nathann

CC: @rbeezer

Component: graph theory

Author: Nathann Cohen

Reviewer: Frédéric Chapoton

Merged: sage-5.12.beta2

Issue created by migration from https://trac.sagemath.org/ticket/14547

[fchapoton]

comment:3

Attachment: trac_14547.patch.gz

looks good to me. I have made cosmetic changes (pep8) in my review patch.

If you are happy with that, you can set a positive review.

[nathanncohen]

comment:4

Excellent ! Thank you very much :-)

Nathann

[nathanncohen]

Reviewer: Frédéric Chapoton

[jdemeyer]

comment:6

The reviewer patch needs a proper commit message.

[fchapoton]

Attachment: trac_14547_review.patch.gz

[fchapoton]

comment:7

commit message added

[jdemeyer]

Merged: sage-5.12.beta2