Installing and loading R packages

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Installing and loading R packages

Users can download, install, and update packages from
the repositories.

R allows users to create their own packages, official and non-official
repositories are provided to manage these user-created packages.

CRAN is the official R package repository

CRAN is a network of FTP and web servers around the world that store identical, up-to-date versions of code and documentation for R. You may select the closest CRAN mirror to your location to download packages.

To load a list of installed packages:
- library()

Setting the default CRAN mirror:
- chooseCRANmirror()

Install a package from CRAN; take package e1071 as an example:

Update a package from CRAN; take package e1071 as an example:

Load the package the package:
- library(e1071)

If you would like to view the documentation of the package, you can use the help function:
- help(package ="e1071")

If you would like to view the documentation of the function, you can use the help function:
- help(svm, e1071)

To view the argument taken for the function, simply use the args function. For example, if you would like to know the argument taken for the lm function:
- args(lm)

Some packages will provide examples and demos; you can use example or demo to view an example or demo. For example, one can view an example of the lm package and a demo of the graphics package by typing the following commands:
- example(lm)
- demo(graphics)