to https://github.com/TomKellyGenetics/graphsim
To get the iGraph package from CRAN:
install.packages("igraph")
To get the extensions from github:
# install.packages("devtools")
devtools::install_github("TomKellyGenetics/plot.igraph")
Adapted from the plotting blog http://blog.ryanwalker.us/2014/03/going-viral-with-rs-igraph-package.html (as shared on Rbloggers).
https://rawgit.com/TomKellyGenetics/plot.igraph/master/vignettes/plots_viral_quantitate.html
See the following vignette for the extensions provided by this package, namely inclusion of inhition or negating arrows.
https://rawgit.com/TomKellyGenetics/plot.igraph/master/vignettes/plots_directed.html