I am trying to use R to repeatedly plot data to an X11 device from a file
that is being updated every five minutes. My initial strategy was to use a
loop in R that roughly looks like this
while (TRUE){
system("sleep 10")
plot(x,y)
}
However, this had an interesting side effect: when I try to resize the plot
window under X, R never processes the resize events like it would if I had
invoked R interactively and typed a command into the xterm I was running R
from.
I would like to get around this somehow so that R does not go to sleep like
this and stop processing X events.
My next attempt went like this. I wrapped the R script in a bash script and
had the bash script go to sleep:
#!/bin/bash
(
while true; do
sleep 10
echo "plot(x,y)"
done
) | R --no-save
This fared no better. I then tried the same thing with a named pipe with no
more success.
Any ideas?
Chris Marshall
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
On Mon, 20 Aug 2001, Chris Marshall wrote:> I am trying to use R to repeatedly plot data to an X11 device from a file > that is being updated every five minutes. My initial strategy was to use a > loop in R that roughly looks like this > > while (TRUE){ > system("sleep 10") > plot(x,y) > } > > However, this had an interesting side effect: when I try to resize the plot > window under X, R never processes the resize events like it would if I had > invoked R interactively and typed a command into the xterm I was running R > from. > > I would like to get around this somehow so that R does not go to sleep like > this and stop processing X events. >Well, you did *ask* it to go to sleep ;-) The Sys.sleep() function is designed for this. It waits without suspending the event loop so the following should work repeat({ Sys.sleep(10) plot(x,y) }) (or use while(TRUE){} instead of repeat() if you prefer) However, there appears to be a bug. On my machine (Debian Linux) does works, but if you interrupt Sys.sleep() with CTRL-C and then rerun it there is a segfault. If you don't plan to interrupt the loop with CTRL-C you should be fine (and you may be fine on other OSes). -thomas Thomas Lumley Asst. Professor, Biostatistics tlumley at u.washington.edu University of Washington, Seattle -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
Perfect! Works like a charm! Thank you so much. I can't believe I got an answer in an hour. R has to be one of the best supported tools in existance. Chris Marshall -----Original Message----- From: Thomas Lumley To: Chris Marshall Cc: 'r-help at lists.R-project.org' Sent: 8/20/01 2:06 PM Subject: Re: [R] using R to generate resizable real-time plots On Mon, 20 Aug 2001, Chris Marshall wrote:> I am trying to use R to repeatedly plot data to an X11 device from afile> that is being updated every five minutes. My initial strategy was touse a> loop in R that roughly looks like this > > while (TRUE){ > system("sleep 10") > plot(x,y) > } > > However, this had an interesting side effect: when I try to resize theplot> window under X, R never processes the resize events like it would if Ihad> invoked R interactively and typed a command into the xterm I wasrunning R> from. > > I would like to get around this somehow so that R does not go to sleeplike> this and stop processing X events. >Well, you did *ask* it to go to sleep ;-) The Sys.sleep() function is designed for this. It waits without suspending the event loop so the following should work repeat({ Sys.sleep(10) plot(x,y) }) (or use while(TRUE){} instead of repeat() if you prefer) However, there appears to be a bug. On my machine (Debian Linux) does works, but if you interrupt Sys.sleep() with CTRL-C and then rerun it there is a segfault. If you don't plan to interrupt the loop with CTRL-C you should be fine (and you may be fine on other OSes). -thomas Thomas Lumley Asst. Professor, Biostatistics tlumley at u.washington.edu University of Washington, Seattle -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._