| sys.source {base} | R Documentation |
Parses expressions in the given file, and then successively evaluates them in the specified environment.
sys.source(file, envir = baseenv(), chdir = FALSE,
keep.source = getOption("keep.source.pkgs"))
file |
a character string naming the file to be read from |
envir |
an R object specifying the environment in which the
expressions are to be evaluated. May also be a list or an integer.
The default value |
chdir |
logical; if |
keep.source |
logical. If |
For large files, keep.source = FALSE may save quite a bit of
memory.
In order for the code being evaluated to use the correct environment
(for example, in global assignments), source code in packages should
call topenv(), which will return the namespace, if any,
the environment set up by sys.source, or the global environment
if a saved image is being used.
source, and library which uses
sys.source.
## a simple way to put some objects in an environment
## high on the search path
tmp <- tempfile()
writeLines("aaa <- pi", tmp)
env <- attach(NULL, name = "myenv")
sys.source(tmp, env)
unlink(tmp)
search()
aaa
detach("myenv")