R Packages

To use a package, it must first be installed on the system. Then you load it into your current session.

To get the list of packages loaded by default:

> getOption("defaultPackages")

To see the list of currently loaded packages:

> (.packages())

To show all available packages:

(.packages(all.available=TRUE))

To install a package:

install.packages("pkg1")             # for a single package
install.packages(c("pkg1", "pkg2"))  # for multiple packages

To load a package:

> library(rpart)

To see the version of a package:

packageVersion("afex")