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Discrete Mathematics Graphs and Networks Wolfram Language

Partially ordered graphs like Dynkin diagrams ?

Posted 9 years ago

Hello everyone, I'm looking for a way to draw partially ordered graphs with multiple edges in Mathematica : typically, I would like to draw Dynkin diagrams. More precisely, this is the property of the graph I'm trying to construct : The graph can have simple and/or multiple edges If an edge is simple, then it is undirected If an edge is multiple, then it is directed Typical exemples of such diagrams can be seen on this page. I tried with Graph, AdgencyGraph and GraphPlot, but I did'nt work out a solution. Does anyone have an idea ? Thanks.

POSTED BY: Sylvain Lacroix

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Posted 9 years ago

Can you show the code that you have tried? The Graph supports mixed directed / undirected and multi-edges, so it is not impossible. Graph[RandomChoice[{Style[#1 -> #2, Red], #1 <-> #2}] & @@@ RandomInteger[{1, 5}, {30, 2}]]

POSTED BY: Sam Carrettie

Posted 9 years ago

First of all, thank you for your answer. I simply tried Graph[{1 -> 2, 2 <-> 3}] and I have this error message : Graph::supp: Mixed graphs and multigraphs are not supported. I tried copying exactly you code and I have the same error. Could it be some problem of version : I have Mathematica 9.0 student edition. I'll try to install the last version, but I only have a student licence (I've read that there was a few things that weren't included in the student version, maybe this is one of them).