Return the R home directory, or the full path to a component of the R installation.
R.home(component = "home")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.
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
Makefiles).
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.