Invoke a system command from R with dynamic variable name

Question

I want to call python script using the system command. I am passing a parameter with it, but the variable is dynamic. I am not sure how to paste the filename dynamically. I would like the Filename to be changed depending on the user input.

system('python testMethod.py Filename', wait = TRUE)

Wrap system in a function that takes user input or use some system level reader/prompt? — NelsonGon
– NelsonGon, Commented May 15, 2020 at 16:27

thorepet · Accepted Answer · 2020-05-15 16:31:41Z

4

Use paste0 to create the command string:

filenname <- "Filename"
system(paste0("python testMethod.py ", filename), wait = TRUE)

Edit: M--'s suggestion does make it cleaner:

filenname <- "Filename"
system(paste("python testMethod.py", filename), wait = TRUE)

edited May 15, 2020 at 16:31

answered May 15, 2020 at 16:28

thorepet

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2 Comments

M-- Over a year ago

Use paste instead of paste0 and get rid of that manually entered space at the end of first string. That's cleaner.

jangorecki Over a year ago

also paste is more portable than paste0 to older versions of R

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