Include digraphs in pdf output of Rmarkdown
String of filename to save to, with exention .pdf
Either a string defining a digraph in the DOT language, or a string of a .gv filename (this file must be stored in the same working directory).
Plots a digraph in the pdf output of an Rmarkdown document, when function is embedded in a code chunk.
## Not run: pdf_digraph_gv("graph.pdf", "graph.gv") ## End(Not run)
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