如何进入R中文件的目录？

Question

I have a directory "space" containing 300 CSV files, and its path is "C://rstuff//space".

And I have a function:

myfunction <- function(my_dir, x, y){

      }

I want to open some of the csv files, so I want to get the location of these files,and I use the argument 'my_dir' to indicate the location of the CSV files. I want to use setwd(paste0("C://rstuff//", my_dir)) (thanks for Batanichek's comment), but I think my way is not good to set the path, if I don't know the path exactly, what should I do? Is there any good methods?

Answer 1

You can use list.files

setwd("C://rstuff//space")
my_files<-list.files(pattern = ".csv", 
                     full.names = TRUE, recursive = TRUE, ignore.case = TRUE)

This finds all csv files in your working directory and give you the path starting from your working directory.

 [1] "./csvs2/data_1-10.csv"         
 [2] "./csvs2/old/data_1001-1010.csv"
 [3] "./overview/results.csv"

Then you can specify the ones you want to use. I for example give the important csv files a number after an "_" eg "data_23". So you can exclude all non-important files with:

my_files<-my_files[-(which(grepl("_", my_files)==FALSE))]