how do I make install.packages return an error if an R package cannot be installed?

Question

install.packages() returns a warning if a package cannot be installed (for instance, if it is unavailable); for example:

install.packages(\"nota         


        

Answer 1

Expanding on the quick comment:

R> AP <- available.packages()
R> "notapackage" %in% AP[,1]      # expected to yield FALSE
[1] FALSE
R> "digest" %in% AP[,1]           # whereas this should be TRUE
[1] TRUE
R>