Question

I want to simulate non-directional graphs with .dot. To that end, I want the arrowhead type to be "none". How do I set this?

"f" -> "t" [label=2],[arrowhead=none]
"m" -> "d" [label=0],[arrowhead=none]

The above is not working.

Answer 1

"f" -> "t" [label=2, arrowhead=none]

For example:

digraph g {
  rankdir="LR";
  dpi=300;
  node[
    fontname="Arial",
    shape="square",
    fixedsize=false,
    width=1.809,
    style=rounded
  ];

  edge [
    arrowhead="none"
  ];

  Node1 -> Node2;
  Node2 -> Node3;
  Node3 -> Node4;
}

Answer 2

Another nice way is to use the dir attribute:

   "f" -> "t" [label=2 dir=none]
   "m" -> "d" [label=0 dir=none]

See also http://martin-loetzsch.de/DOTML/dir.html

Answer 3

You can change the arrow head either locally or globally.

digraph G
{
    edge[arrowhead="odiamond"]; // Globally

    A -> B
    A -> C [arrowhead="vee"]; // Locally
    C -> D
    C -> E
}

You can test it on GraphvizFiddle

All possible values could be found Here

Answer 4

If you don t have to create a digraph, you can use a graph:

Replace digraph { on the top of your dot file by graph {.
Change your node relationships to: a -- b;

Answer 5

"f" -> "t" [label=2 arrowhead=none]
"m" -> "d" [label=0 arrowhead=none]

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