How to completely stop a script after stop()?

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Date: Sat, 15 Jan 2011 11:29:20 -0500
From: carl at witthoft.com
To: r-help at r-project.org
Subject: [R] How to *completely* stop a script after stop()?

Somehow this reminds me of a famous FORTRAN code snippet:

10 STOP
STOP
STOP
! IN CASE STILL SKIDDING
GOTO 10
you can laugh about it but I actually have had to write code like
this in interactive applications ( I guess you could laugh at me too LOL)
and sometimes you need it but sometimes it makes things worse. Of course,
normally you would use something like a try/catch for exceptional
conditions but even her it is not always easy to remember to 
close all the resources and in multithreaded code it becomes
even more complex ( there used to be a way in java to stop a thread
but this was removed due to it being inherently unsafe.). 

I've run into this with ctrl-C, my sacred stop all seems to kill R and
leave R term or something so cygwin ends up sending some commands
to bash and some to R until I kill Rterm in task manager. I always
assume I have ctrl-C in my script based data analysis as you really
can't always know how long you want things to go in with exploratory
work ( put ctrl-C in a prespecified analysis plan and see how that goes
over LOL).

From: Marius Hofert 
Date: Sat, 15 Jan 2011 09:09:20 +0100

Dear expeRts,

is there a neat way to *completely* stop a script after an error
occured? For example, consider the following script:

## ==== file.R ====

for(i in 1:10){

print(i)
if(i == 5) stop("i == 5")

}
for(i in 11:100) print(i)

## ================

stop() behaves like it should namely to stop the execution of the
*current* expression, but I was wondering if it is possible to *really*
stop the script after the first for loop [so without executing the
second for loop or anything after that point]. Of course one could use
something like "if(there was an error) do not continue" but that's not
really nice.

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How to *completely* stop a script after stop()?

Thread (6 messages)

How to completely stop a script after stop()?