[R] How to *completely* stop a script after stop()?

Mike Marchywka marchywka at hotmail.com
Sat Jan 15 17:59:00 CET 2011

> 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
> 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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