| sys.source {base} | R Documentation |
Parses expressions in the given file, and then successively evaluates them in the specified environment.
sys.source(file, envir = NULL, 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 NULL corresponds to evaluation in the base
environment. This is probably not what you want; you should
typically supply an explicit envir argument. |
chdir |
logical; if TRUE, the R working directory is
changed to the directory containing file for evaluating. |
keep.source |
logical. If TRUE, functions “keep
their source” including comments, see
options(keep.source = *) for more details. |
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.