how to install rgtk2 in rstudio?
['From the R command line (e.g. in R-Studio), install the RGtk2 package by running: install.packages("RGtk2", depen=T) ... ', 'Then load the package by running: library(RGtk2) ... ', 'Restart R/Rstudio and confirm GTK is now up and running by reloading the package: library(RGtk2)']