system.mfile returns paths to .m files installed with packages.
arguments passed to
a character string with the name of a single package. An error occurs if more than one package name is given.
system.mfile is a shortcut for:
system.file('m-files', ..., package = package)
As such it returns empty strings if the requested file does not exist.
If no arguments besides
package are passed, it returns the full
path to the package's sub-directory m-files/ – if it exists.
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