How To Activate a Package in R
What is Package in R?
R packages are extensions to the R statistical programming language. R packages contain code, data, and documentation in a standardised collection format that can be installed by users of R, typically via a centralised software repository such as CRAN.
How To Activate a Package in R
To use the package, invoke the library(package) command to load it into the current session. (You need to do this once in each session, unless you customize your environment to automatically load it each time.)
Frequently Asked Questions
How to load data from package in R?
If you look at the package listing in the Packages panel, you will find a package called datasets. Simply check the checkbox next to the package name to load the package and gain access to the datasets. You can also click on the package name and RStudio will open a help file describing the datasets in this package.
How do I know if a package is installed in RStudio?
To check whether a package is installed, it is better to use find. package() than installed. packages() because the latter, as its docs state, can be slow on some systems. In both cases, it does not mean the package is usable, for that you’d need to use library() or require() .
How do I install an R package locally?
To install an R package locally, specify the local directory where you want to install by using the “-l” option in the “R CMD INSTALL” command. For example, to install the R package in the local directory “/usr/me/localR/library”, use the “R CMD INSTALL” as follows.
What is library command in R?
library(help = somename) computes basic information about the package somename, and returns this in an object of class “packageInfo” . (The structure of this class may change in future versions.) When used with the default value ( NULL ) for lib. loc , the attached packages are searched before the libraries.
How do I load all packages in RStudio?
The RStudio Load All command (keyboard shortcut: Ctrl+Shift+L) calls the devtools load_all function for the current package.
How do I remove and reinstall a package in R?
Go to the Packages in right bottom corner of Rstudio, sear the package name and click on the adjacent X icon to remove it. Reinstall the package from Bioconductor/CRAN
Can you unload a package in R?
If the package is not loaded already, it does nothing. It’s not always possible to cleanly unload a package: see the caveats in unload() for some of the potential failure points. If in doubt, restart R and reload the package with library() .
How to install a package in RStudio from command line?
The most common way is to use the CRAN repository, then you just need the name of the package and use the command install. packages(“package”) . For example, the oldest package published in CRAN and still online and being updated is the vioplot package, from Daniel Adler.
Do I need to install R packages every time?
We only need to install a package once on our computer. However, to use the package, we need to load the library every time we start a new R/RStudio environment. You can think of this as installing a bulb versus turning on the light.
What is the difference between a library and a package?
A library is fundamentally a collection of packages. Its objective is to offer a collection of ready-to-use features so that users won’t need to be concerned about additional packages. To add functionality to your code, you must include a library. It does not impose any code standards on you as well.