Question

This might be a very basic question, but have not found a convincing answer yet. When executing an R script within the R environment, I can either do source(foo.R) or system("Rscript foo.R"). Is there any difference at all between the two approaches, and if so how do the two approaches compare?

Answer 1

它们的影响基本不同。

<条码>源(“foo.R”) 指: R process to take its observations from < code>"foo.R" .
system(“Rscript foo.R”>> 使用操作系统指令发射separate R process, within which the content of "foo.R" are evaluation.

www.un.org/Depts/DGACM/index_french.htm 电话只直接影响到本届会议,但除外,否则,它将在你目前的任期内印刷该届R会议的产出。 (你可以在<条码>系统中()打电话,设定<条码>show.output.on.console=FALSE。)

Answer 2

I think source(foo.R) includes the source code of that file (foo.R) into your current environment. If you define a variable within foo.R, let s say x <- 5, and in your current project you define x <- 6 beforehand, x becomes 5.

system(“Rscript foo.R”>>, 随附理由/foo.R,因此,你目前的环境根本不受影响。

Answer 3

作为对@Ramnath评论的答复:sys.source(“foo”)与不相同。 Rscript foo。例如,你可使用<编码>sys.source:

e <- new.env()
sys.source("foo", e)  # foo creates a bunch of objects in environment e
z <- with(e, {
    # do stuff with e....
})
rm(e)

如果你正在制造几个中间物体,你会这样做,而后,这些物体就会 st,最后结果会回来。你们不想保留中间物体,这样就把物体放在自己的临时环境中,就是一个轻而易举的办法。

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