Question: What is an R Package?
Answer: R package is a collection of objects that R Language can use. A package contains functions, data set, and documentation (which helps how to use the package) or other objects such as dynamically loaded libraries of already compiled code.
Question: How do I see which packages I have available?
Answer: To see which packages you have to use the command at the R prompt
Question: Which packages do I already have?
Answer: To see what packages are installed one can use the installed.packages() command a R prompt. The output will show the packages installed.
Question: How one can load a Package in R language?
Answer: Basic packages are already loaded. If you want to load a downloaded version of packages use the command
where package name is the name of the package you want to load. Here in the example, we used the “car”, it means “car” package will be loaded.
Question: How one can see the documentation of a particular package?
Answer: To see the documentation of particular package use the command
for more information about getting help follow the link: Getting Help in R Language
Question: How do I see the help for a specific function?
Answer: To get help about a function in R use command
> help(“function name”)
> ? function name
Question: What functions and datasets are available in a package?
Answer: To check what functions and datasets are in a package using the help command at R prompt. This will provide package information giving a list of functions and datasets.
> help(package = “MASS”)
Note that once a package is loaded, the help command can also be used with all available functions and datasets.
Question: How can one add or delete a package?
Answer: A package can be installed using command
> install.packages(“package name”)
and package can be removed or deleted using command
> remove.packages(“package name”)