Graphviz Dot, mix directed and undirected

Question

For my application I need to represent simultaneously (on the same graph) two relations: one is simmetric, the other is not.

Targets:

• Ideally the two relation should result in edges having different colors;
• For the symmetric relation I would like not to have double-edges;

Is there a way of doing this with dot?

Answer 1

digraph {      A; B; C      subgraph Rel1 {         edge [dir=none, color=red]         A -> B -> C -> A     }      subgraph Rel2 {         edge [color=blue]          B -> C         C -> A     }  } 

Answer 2

You can pass dir=none as an edge property to the undirected graph connections:

digraph {      A; B; C          A -> B     B -> C     C -> A [dir=none] }