Find Names of R System Files
Finds the full file names of files in packages etc.
system.file(..., package = "base", lib.loc = NULL, mustWork = FALSE)
- character vectors, specifying subdirectory and file(s) within some package. The default, none, returns the root of the package. Wildcards are not supported.
- a character string with the name of a single package. An error occurs if more than one package name is given.
- a character vector with path names of R libraries.
See Details for the meaning of the default value of
- logical. If
TRUE, an error is given if there are no matching files.
This checks the existence of the specified files with
file.exists. So file paths are only returned if there
are sufficient permissions to establish their existence.
The unnamed arguments in
... are usually character strings, but
if character vectors they are recycled to the same length.
find.package to find the package, and hence
with the default
lib.loc = NULL looks first for attached
packages then in each library listed in
Note that if a namespace is loaded but the package is not attached,
this will look only on
A character vector of positive length, containing the file paths
..., or the empty string,
"", if none matched (unless
mustWork = TRUE).If matching the root of a package, there is no trailing separator.
system.file()with no arguments gives the root of the base package.
Sys.glob to find paths via wildcards.
system.file() # The root of the 'base' package system.file(package = "stats") # The root of package 'stats' system.file("INDEX") system.file("help", "AnIndex", package = "splines")