Is Rgraphviz no longer available for R? [duplicate]

Answer 1

You just need to remember that the instruction install.packages requires you to enclose the package name between quotes, like this:

install.packages("Rgraphviz")

Answer 2

You need to install it directly from the bioconductors site.

For R versions >= 3.5:

install.packages("BiocManager")
BiocManager::install("Rgraphviz")

For older R versions:

source("http://bioconductor.org/biocLite.R")
biocLite("Rgraphviz")

More info can be found here.