连接路径的函数? [英] Function to concatenate paths?

问题描述

是否有连接路径的现有函数?

Is there an existing function to concatenate paths?

我知道实现起来并不难，但仍然......除了处理尾随 /(或 )之外，我还需要注意适当的操作系统路径格式检测(即我们是写C:dirfile 还是/dir/file).

I know it is not that difficult to implement, but still... besides taking care of trailing / (or ) I would need to take care of proper OS path format detection (i.e. whether we write C:dirfile or /dir/file).

正如我所说，我相信我知道如何实施它；问题是:我应该这样做吗?现有 R 包中是否已存在该功能?

As I said, I believe I know how to implement it; the question is: should I do it? Does the functionality already exist in existing R package?

推荐答案

是的，file.path()

R> file.path("usr", "local", "lib")
[1] "usr/local/lib"
R> 

对于包中的文件，还有同样有用的system.path():

There is also the equally useful system.path() for files in a package:

R> system.file("extdata", "date_time_zonespec.csv", package="RcppBDT")
[1] "/usr/local/lib/R/site-library/RcppBDT/extdata/date_time_zonespec.csv"
R> 

这将获得文件 extdata/date_time_zonespec.csv 与

1. 安装包的位置，以及
2. 操作系统

这非常方便.最后，还有

which is very handy. Lastly, there is also

R> .Platform$file.sep
[1] "/"
R> 

如果你坚持手动操作.

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