On 17/11/2008 9:14 AM, Brigid Mooney wrote:
Is there a better command to use rather than source which would take
command arguments?
I ask because I currently have 6 parameters, will likely have additional
paramaters later, and would like to be able to have default values for
each, if I do not specify new values.
The way I would do it is to write a function to do the calculations.
Then you can have defaults for the parameters of the function. You
might choose to put the function in your script, or more easily, but I
would recommend against it, just keep a copy in your current workspace.
So for example,
DoIt <- function(param1 = 1, param2 = 2) {
... lots of commands ...
}
Then
Doit()
Doit(param1 = 7)
etc.
Duncan Murdoch
Thanks so much!
On Mon, Nov 17, 2008 at 9:06 AM, Duncan Murdoch <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Brigid Mooney wrote:
Hi Everyone,
I am pretty new to R and so far have mostly been using R
interactively
through the Windows console.
I'm starting to write some scripts, and have been executing them
using the
source() command, i.e. source(myRfile.R).
My questions is how can I pass command line arguments to R. My file
"myRfile.R" has some global variables which I would like to be
able to set
at run-time, without having to go in and edit the text of the
file each time
I want to run it.
I can't seem to find much information on this topic for Windows
and using it
with the console - so any help would be greatly appreciated.
This is the same on all platforms, Windows isn't special.
When you use source(), any variables currently defined in the R
session will be visible to your script. There is no "command line"
needed, because you're executing the R code in the same session.
So you could do this:
paramValue <- 10
source("myRfile.R")
paramValue <- 15
source("myRfile.R")
The quotes are necessary, because source(myRfile.R) would go looking
for a variable named myRfile.R, rather than using "myRfile.R" as the
filename.
Duncan Murdoch
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