R help - Jan 2011 - How to *completely* stop a script after stop()?

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.

Cheers,

Marius

I take you don't use source() to execute your scripts. When using source,
stop() aborts the complete script, just as you indent to. 
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Somehow this reminds me of a famous FORTRAN code snippet:

10 STOP
STOP
STOP
! IN CASE STILL SKIDDING
GOTO 10



<quote>
From: Marius Hofert <m_hofert_at_web.de>
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.

Marius -
    Do you get the behaviour you want if you substitute

     if(i == 5){cat('i==5\n');quit(save='n')}

for the line with the call to stop?


 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Sat, 15 Jan 2011, Marius Hofert wrote:
> 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.
>
> Cheers,
>
> Marius
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

I too am encountering this problem.  When I have a large script, if I select
all in the editor and then ctrl-r to run, if it encounters a stop() function
it simply prints an error message and continues to execute the remainder of
the script, as opposed to terminating execution at that line.  The quit()
function exits R altogether, which I don't want.  Yes, I could manually
select only the portion of script which I want to run, but for lengthy
scripts which I run repeatedly (generally changing only the name of the file
I want analyzed), this can be quite tedious.  It appears that the only
solution is to put most of the code in a separate file and call it using
source(); this has the downside of reducing the clarity of the code -- it's
a sort-of structural spaghetti code approach.

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