R: Command line - Error in GenericTranslator$new : could not find function "loadMethod"
I've been reading Text Processing with Ruby over the last week or so and one of the ideas the author describes is setting up your scripts so you can run them directly from the command line.
I wanted to do this with my Wimbledon R script and wrote the following script which uses the 'Rscript' executable so that R doesn't launch in interactive mode:
#!/usr/bin/env Rscript library(rvest) library(dplyr) library(stringr) library(readr) # stuff
Then I tried to run it:
$ time ./wimbledon ... Error in GenericTranslator$new : could not find function "loadMethod" Calls: write.csv ... html_extract_n -> <Anonymous> -> Map -> mapply -> <Anonymous> -> $ Execution halted real 0m1.431s user 0m1.127s sys 0m0.078s
As the error suggests, the script fails when trying to write to a CSV file - it looks like Rscript doesn't load in something from the core library that we need. It turns out adding the following line to our script is all we need:
So we end up with this:
#!/usr/bin/env Rscript library(methods) library(rvest) library(dplyr) library(stringr) library(readr)
And when we run that all is well!