How do I reference a string as the root node of a graph?

Question

I've produced the following tree plot:

But I want the root to be $a$, which is a string. I looked at the documentation, it says:

So it seems it's very easy, we just write something like:
TreePlot[{1 -> 4, 1 -> 6, 1 -> 8, 2 -> 6, 3 -> 8, 4 -> 5, 7 -> 8}, Automatic, 1, VertexLabels -> Automatic]

Where we switch 1 by "a" but this is not working. So how do I reference a string as the root node of a graph?

kglr · Answer

edgelist = {"a" -> "d", "a" -> "f", "a" -> "h", "b" -> "f", "c" -> "h", 
   "d" -> "e", "g" -> "h"};

TreePlot[edgelist, Automatic, "a",    VertexLabels -> Automatic]

TreePlot[edgelist, Automatic, "e",    VertexLabels -> Automatic]

If the vertex list of your tree is Range[8]:
edgelist2 = {1 -> 4, 1 -> 6, 1 -> 8, 2 -> 6, 3 -> 8, 4 -> 5, 7 -> 8};

TreePlot[edgelist2, Automatic, 1, VertexLabels -> Automatic]

you can label the vertices using vlabels:
vlabels = CharacterRange["a", "h"];

TreePlot[edgelist2, Automatic, 1, VertexLabels -> {i_ :> vlabels[[i]]}]

How do I reference a string as the root node of a graph?

One Answer

Add your own answers!

Ask a Question