LaTeX printing Hasse diagram

[Trevor Karn]

Hi all,

I have tried to create a nice image of a Hasse diagram (of the set partitions of {1,2,3,4}) using the command `view(Poset((SetPartitions(4), lambda A,B: A in B.refinements())))`

as suggested in these notes by Mike Zabrocki.

However, when I try, things come out looking a bit messy (image attached). The problem doesn't seem to be with the latex compiler on my end, since (e.g.) the complete bipartite graph comes out looking just fine using `view(graphs.CompleteBipartiteGraph(3,3))`.

Does this seem like a bug, or are there some configurations wrong on my end?

Thanks,

Trevor

[Trevor Karn]

Sorry, I should have added: I'm using 9.6.beta5 on MacOS Monterey v. 12.2.

[Sébastien Labbé]

On 9.6.rc0, I am not able to reproduce the issue. The command `view(Poset((SetPartitions(4), lambda A,B: A in B.refinements())))` produce a nice looking picture level by level.

Sébastien

[Trevor Karn]

Thanks Sébastien, I’ll upgrade and see if that fixes it.

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Best,

Trevor

[Sébastien Labbé]

Also, now that #20343 is in Sage (9.6.beta7). If graphviz is installed and  `sage -i dot2tex` as well, one can do:

sage: P = Poset((SetPartitions(4), lambda A,B: A in B.refinements()))

sage: from sage.misc.latex_standalone import TikzPicture
sage: TikzPicture.from_poset(P, prog='dot').pdf()

The dot graphviz program places the nodes in a tree like form. Valid values for prog are ['dot', 'twopi', 'neato', 'circo', 'fdp'], but they do not create as nice pictures:

sage: TikzPicture.from_poset(P, prog='neato').pdf()

The `from_poset` method is marked as experimental and prints warnings when you use it since it will move in the future within the class Poset. See https://trac.sagemath.org/ticket/33002

[Trevor Karn]

Thanks so much, Sébastien. I `sage -i dot2tex`-ed on 9.6.beta5 and that fixed the problem. Is this something that should be included in the documentation? If so, I can open a ticket and add it, but where do you suggest I do so? The documentation for `view()` seems like too generic of a spot, and as far as I can tell, there is no `Poset.view` method in the documentation. One option would be to add a view method, but that may conflict with the show method and cause confusion.