On Thu, Mar 01, 2012 at 11:18:33PM -0800, statquant2 wrote:
> Hey Petr,
> ok I was thinking that R would handle the split by itself.
> I guess using eval we can even make arg1=val1 being executed by R.
Hi.
For executing the assignments, try myRscript.R containing
args <- commandArgs(TRUE);
argmat <- sapply(strsplit(args, "="), identity)
for (i in seq.int(length=ncol(argmat))) {
assign(argmat[1, i], argmat[2, i])
}
# available variables
print(ls())
# print variables arg1, arg2, arg3
print(arg1)
print(arg2)
print(arg3)
Then the command line
./myRscript.R arg1=aa arg2=22 arg3=cc
yields
[1] "argmat" "args" "arg1" "arg2" "arg3" "i"
[1] "aa"
[1] "22"
[1] "cc"
Another option for setting some variables before executing an R script
is to have two scripts, a shell script and an R script, containing
shell script "callR.sh"
#!/bin/bash
<PATH_TO_R>/bin/R --vanilla << EEE
args <- c("$2","$3","$4","$5")
source("$1")
EEE
a trivial R script "tst.R"
print(args)
Then,
./callR.sh tst.R aa 22 cc
leads to
...
...
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> args <- c("aa","22","cc","")
> source("tst.R")
[1] "aa" "22" "cc" ""
>
Hope this helps.
Petr Savicky.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
