Return the R Home Directory

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Description

Return the R home directory, or the full path to a component of the R installation.

Usage

1
R.home(component = "home")

Arguments

component

As well as "home" which gives the R home directory, other known values are "bin", "doc", "etc", "include", "modules" and "share" giving the paths to the corresponding parts of an R installation.

Details

The R home directory is the top-level directory of the R installation being run.

The R home directory is often referred to as R_HOME, and is the value of an environment variable of that name in an R session. It can be found outside an R session by R RHOME.

Value

A character string giving the R home directory or path to a particular component. Normally the components are all subdirectories of the R home directory, but this need not be the case in a Unix-like installation.

The value for "modules" and on Windows "bin" is a sub-architecture-specific location.

On a Unix-alike, the constructed paths are based on the current values of the environment variables R_HOME and where set R_SHARE_DIR, R_DOC_DIR and R_INCLUDE_DIR (these are set on startup and should not be altered).

On Windows the values of R.home() and R_HOME are switched to the 8.3 short form of path elements if required and if the Windows service to do that is enabled. The value of R_HOME is set to use forward slashes (since many package maintainers pass it unquoted to shells, for example in ‘Makefile’s).

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