A character string of a path (that will be created if create = TRUE) in a
sub-directory of the tempdir().
Arguments
sub
Character string, length 1. Can be a result of
file.path("smth", "smth2") for nested temporary subdirectories.
If the zero length character, then a random sub-directory will be created.
tempdir
Optional character string where the temporary
directory should be placed. Defaults to getOption("reproducible.tempPath").
create
Logical. Should the directory be created. Default TRUE.