How do I get the absolute path of an input file in R

Question

I am using Rscript to plot some figures from a given CSV file in some directory, which is not necessarily my current working directory. I can call it as follows:

./script.r ../some_directory/inputfile.csv

Now I want to output my figures in the same directory (../some_directory), but I have no idea how to do that. I tried to get the absolute path for the input file because from this I could construct the output path, but I couldn't find out how to do that.

question from:https://stackoverflow.com/questions/13311180/how-do-i-get-the-absolute-path-of-an-input-file-in-r

Answer 1

normalizePath() #Converts file paths to canonical user-understandable form

or

library(tools)
file_path_as_absolute()