The R interpreter is defined in the Settings | R Settings :

But I am unable to run a simple R command/script via

install.packages("benford.analysis")

Why is the interpreter not found?

CodePudding user response：

I had installed the R plugin and did not restart the IDE. In the past Intellij-Idea had always required a restart. I had thought - given I was not required to restart before using the plugin - that maybe in the lastest 2021.2.X they had relaxed that requirement.

Well what happened is the plugin partially worked : syntax highlighting popped up and the R commands / menu items appeared. But apparently this "install plugins without restart" is not reliable - at least for the R plugin. After restarting IJ the problem desribed inthe question disappeared and R scripts appear to be working within Intellij now.