I've got a R script for which I'd like to be able to supply several command-line parameters (rather than hardcode parameter values in the code itself). The script runs on Windows.
I can't find info on how to read parameters supplied on the command-line into my R script. I'd be surprised if it can't be done, so maybe I'm just not using the best keywords in my Google search...
Answer:
I made two files: exmpl.bat and exmpl.R.
exmpl.bat:
set R_Script="C:\Program Files\R-3.0.2\bin\RScript.exe"
%R_Script% exmpl.R 2010-01-28 example 100 > exmpl.batch 2>&1
Alternatively using Rterm.exe:
set R_TERM="C:\Program Files\R-3.0.2\bin\i386\Rterm.exe"
%R_TERM% --no-restore --no-save --args 2010-01-28 example 100 < exmpl.R > exmpl.batch 2>&1
exmpl.R:
options(echo=TRUE) # if you want see commands in output file
args <- span=""> commandArgs(trailingOnly = TRUE)
print(args)
# trailingOnly=TRUE means that only your arguments are returned, check:
# print(commandsArgs(trailingOnly=FALSE))
start_date <- span=""> as.Date(args[1])
name <- span=""> args[2]
n <- span=""> as.integer(args[3])
rm(args)
# Some computations:
x <- span=""> rnorm(n)
png(paste(name,".png",sep=""))
plot(start_date+(1L:n), x)
dev.off()
summary(x)
Save both files in the same directory and start exmpl.bat. In result you got:
example.png with some plotexmpl.batch with all what was done
Just to add - you could add environment variable %R_Script%:
"C:\Program Files\R-3.0.2\bin\RScript.exe"
and use it in your batch scripts as %R_Script% .......
Differences between RScript and Rterm:
No comments:
Post a Comment