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Re: Re: Label vertices in Graph to display with GraphPlot
What was the problem with the documentation? The documentation for
VertexRenderingFunction has the following as the first entry under
"More Information":
VertexRenderingFunction->f specifies that each vertex should be
rendered with the graphics primitives given by f[rk,vk], where rk is
the coordinate position where the vertex is being placed, and vk is
its name.
On 6 Apr 2008, at 11:43, Murray Eisenberg wrote:
> At last I figured it out. (And no thanks to the documentation.)
>
> Here's a simple example of using non-default vertex labels in a
> GraphPlot display with a graph created by a GraphPlot function:
>
> <<Combinatorica`
>
> labels = {"a", "b", "c", "d"};
> GraphPlot[Wheel[4], Method -> None,
> VertexRenderingFunction ->
> ({EdgeForm[{Brown}], Yellow, Disk[#1, 0.05],
> Black, Text[labels[[#2]], #1]} &),
> BaseStyle -> {FontSize -> 16}]
>
> The "secret" is in the meaning of the slot argument #2 to Text within
> the VertexRenderingFunction.
>
> Murray Eisenberg wrote:
>> I'm using some Combinatorica functions to create graphs where I do
>> not
>> specify individually the vertices -- and hence do not individually
>> specify the vertex labels I want, e.g.:
>>
>> g = RotateVertices[Cycle[5], \[Pi]/10]; g = AddEdge[g, {2, 5}];
>> g = SetGraphOptions[g, VertexLabel -> Characters["abcde"]];
>>
>> If I use Combinatorica`ShowGraph, then I'll see the vertex labels:
>>
>> ShowGraph[g]
>>
>> However, if I use Mathematica 6's kernel function GraphPlot, I
>> don't see
>> these individual labels, but rather the entire list {a,b,c,d,e} of
>> labels at each vertex!
>>
>> GraphPlot[g,Method->None,VertexRenderingFunction->(Text[#2,#1]&)
>>
>> How do I coerce GraphPlot to reproduce the behavior of ShowGraph, so
>> that it labels the individual vertices with a, b, c, d, e?
>>
>> (The interaction between Combintorica's graph-creating functions,
>> on the
>> one hand, and GraphPlot, on the other hand, remains mysterious and
>> severely underdocumented for me.
>>
>> It seems there's a clear attempt to migrate display of graphs to the
>> kernel function GraphPlot and thereby discourage use of ShowGraph,
>> yet
>> in almost everything I've attempted so far, GraphPlot does not so
>> readily or gracefully reproduce the functionality of Combinatorica'a
>> ShowGraph. This is most especially the case as it affects relative
>> newcomers to Mathematica like my students.)
>
> --
> Murray Eisenberg murray at math.umass.edu
> Mathematics & Statistics Dept.
> Lederle Graduate Research Tower phone 413 549-1020 (H)
> University of Massachusetts 413 545-2859 (W)
> 710 North Pleasant Street fax 413 545-1801
> Amherst, MA 01003-9305
>
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