Sometimes a package is needed that is not part of the R installation. It is easy to install it, and all its dependencies.

The easiest way to install it is:

install.packages("package_name", dependencies=TRUE)

dependencies=TRUE looks for other packages required by the package to be installed, and installs them too.

The computer needs to be online for the command to work. If there is an error message, go to Preferences > Startup and choose a different 'default CRAN mirror'.

If it still doesn't work, you can try to find the package from 'Packages & Data > Package Installer'. For example BioConductor packages are installed from there.

If the package is not found in a binary package, you can try adding

, type="source"

in the install command.

Installation only needs to happen once. The next time you want to use the package, you can just load it by

library(package_name)

Update all packages

update.packages(ask=FALSE, checkBuilt=TRUE)