Mengurai ekspresi dalam file tertentu, lalu mengevaluasinya secara berturut-turut di lingkungan yang ditentukan.
sys.source(file, envir = baseenv(), chdir = FALSE,
keep.source = getOption("keep.source.pkgs"),
keep.parse.data = getOption("keep.parse.data.pkgs"),
toplevel.env = as.environment(envir))| Parameter | Deskripsi |
|---|---|
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. |
keep.parse.data |
logical. If TRUE and keep.source is also TRUE, functions keep parse data with their source, see options(keep.parse.data = *) for more details. |
toplevel.env |
an R environment to be used as top level while evaluating the expressions. This argument is useful for frameworks running package tests; the default should be used in other cases |
# NOT RUN {
## 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")
# }