Hello,
Does anyone know a way of interrupting a loop by pressing a key (besides
ctrl-c)?
My problem is the following:
I have a machine acquiring data and saving text files into a directory.
I have an R script that read those files, process them and plots the
results.
What I would like to do is: process the data as the files appear in the
folder (I've done that do with a loop that checks the number of files)
and when the machine stops acquiring the data, break the loop and do
some other calculations with the entire dataset.
I've tried a couple of solutions:
1) Setting a timer that, if certain amount of time goes by and no new
file is created, the loop is broken and the remaining calculations
occur. However, this solution is dependent on the machine acquiring
time, which change with different experiments...
2) I've tried this structure:
f.loop<-function()
{
repeat
{
print("initial calculations")
switch(menu(c("go","stop")),next,break)
}
print("final calculations")
This also works but requires user intervention at each cycle to chose
from "go" and "stop"...
So... back to the initial question. Can I break the cycle with a signal
from the keyboard?
Something like this:
while (Idontpressthe_Y_key)
{
(1) process all files already produced
(2) wait for new files that are yet to be produced
(3) see if I am pressing key Y (go to (1) if I am not, and quit the loop
if I am)
}
Many thanks in advance,
Bruno
------------------------
Bruno Jesus
Centro de Oceanografia
Campo Grande
1740-016 Lisboa
Portugal
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