on 07/01/2008 06:49 PM Erin Hodgess wrote:
Dear R People:
I have used
./R --no-save -q -f e.in >stuff.out
with great success on SUSE10.1 with R-2.7.1.
My question is, please: is there a way to pass in a variable to the
e.in file? I'm fairly sure that the answer is no, but thought I'd
double check.
Thanks in advance,
Sincerely,
Erin
Erin,
If I am correctly interpreting what you are looking to do, see:
?commandArgs
which will let you access the command line as passed to R when invoked
and then be able to parse out parameters. This, used in combination with
the '--args' argument to R, can be useful.
For example, let's say that your 'e.in' contains:
ARGS <- commandArgs(trailingOnly = TRUE)
as.numeric(ARGS[1]) ^ as.numeric(ARGS[2])
and you then use the following invocation of R from the command line:
$ R --no-save --slave < e.in > stuff.out --args 3 5
The result generated is:
$ cat stuff.out
[1] 243
which of course is 3 ^ 5.
HTH,
Marc Schwartz
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