[R] Simple error handling in R

[Gabor Grothendieck]

On Tue, Nov 16, 2010 at 10:58 AM, Aleksey Naumov <anaumov at gmail.com> wrote:
> Hi R experts,
>
> I am looking for a simple error handling approach, whereby I could stop
> function execution with a customized error message. For example:
>
> for (i in 1:10) {
>   if (i == 5)
>      # I'd like to be able to stop right here with an error message I have
> complete control over
> }
>
> The problem with stop() is that I cannot control completely what gets
> printed to the terminal, even with stop(call.=FALSE) there is the "Error:"
> string. I've worked through examples (whatever few there are) for try() and
> tryCatch() and I still cannot understand how to do this. If I supply my own
> error handler function with tryCatch(..., error=function(e) ...) I can
> control the error message, but the loop continues on to i=6, etc.
>
> So I am struggling with error handling in R... It' seems its a lot simpler
> and more consistent e.g. in Python.
>
> Any help would be greatly appreciated!
>

There was a long thread on this a couple of years ago.   You might
want to look at this response regarding callCC and also the other
responses:

http://tolstoy.newcastle.edu.au/R/e5/help/08/11/6967.html

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