DOT in Rmarkdown?

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Hi @joxborrow I find the solution on a @yihui 's post.
See the example 'dot.Rmd' host on GitHub.

Here, the code is written in RMarkdown.

A dot example

A dot-example taken from the man-pages. You need to install the graphviz package.

```{r dot-ex, engine = "dot", fig.cap = "Funky dot", cache=TRUE}
digraph test123 {
  a -> b -> c;
  a -> {x y};
  b [shape=box];
  c [label="hello\nworld",color=blue,fontsize=24,
      fontname="Palatino-Italic",fontcolor=red,style=filled];
  a -> z [label="hi", weight=100];
  x -> z [label="multi-line\nlabel"];
  edge [style=dashed,color=red];
  b -> x;
  {rank=same; b x}
}
```

The output is here https://github.com/yihui/knitr-examples/blob/master/057-engine-dot.md

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