install.packages('package_name')
library(package_name)
Install a package once per R installation (usually once on each computer). This downloads the content so it's on your system, ready to access.
install.packages('package_name')
In RStudio, you can use the Tools > Install Packages... menu.
You can call a function or object from a package directly. This uses part of the package without changing your R environment.
package_name::function_name(...)
If you'll use a function or object many times, you may want to load the package instead. This lets you call the package contents like you would any other function/object.
library(package_name)
function_name(...)
Leave the library line in your code; you'll need to run it every time you start a fresh R session.
