[R] Pause in non-interactive mode
murdoch at stats.uwo.ca
Fri Feb 5 10:47:46 CET 2010
On 05/02/2010 4:31 AM, Jonne Zutt wrote:
> Dear all,
> I've found this nice code fragment on the web
> (from Jan T. Kim if I'm correct):
> hitReturn <- function(msg)
> invisible(readline(sprintf("%s -- hit return", msg)));
> But it does not seem to work in non-interactive mode
> ( I mean, when I start a script like this: R --vanilla < script.R )
> It simply continues, I guess the stdin is not connected?
stdin is connected to script.R. That's what the input redirection does.
> Does somebody know how to make it work.
You need to find some other way to communicate with R besides stdin,
either for your script or for your response to the request to wait.
It's probably easiest to do the former. Just start R --vanilla,
then type source("script.R"). Then stdin is still your terminal, and
the hitReturn function will work.
> My script plots a few graphs (in X11 windows) and I don't want them to
> disappear immediately.
> A Sys.sleep(infinite) would probably work, but I thought there might
> be a better solution?
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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