[R] stop() vs. error() ?

[Andrew Robinson]

Andy,

I'm really not sure that he hasn't told us.  All he wants to do is stop the 
process, without throwing an error.  return() won't work if he's in a nested 
function, it will just send him up to the next level.  For example, let's say 
he's in a loop and calling his function in the loop.  If he detects a 
situation he wants to stop the whole program and report it.  I think that 
return will just terminate the function, and the loop will continue.

e.g.


spend.time <- function(i) {
    if (i == 50) {
        return()
    }
    if (i == 75) {
        stop("Is this an error?")
    }
}

   
for(i in 1:100)
    spend.time(i)

i

Andrew

On Friday 26 March 2004 16:41, Liaw, Andy wrote:
> So you still have not told us what exactly what you are looking for.  What
> do you want some sort of stop() to do inside a function, that is neither an
> error nor returning?  Can you show an example in some other language that
> has such a feature?
>
> Andy
>
> > From: ivo welch [mailto:ivo.welch at yale.edu]
> >
> > Hi jim:  ahhh, but then the error messages are off for "real errors"
> > that occur later.
> >
> > Hi pierre: a return() in a (2nd-level) function can be
> > different from a
> > stop().  one could argue about whether it should be possible
> > to stop()
> > in a function of course, without it being an error().
> >
> > regards,
> >
> > /iaw
> >
> > James MacDonald wrote:
> > > And a closer examination of the help page would lead you to this:
> > >
> > > options(show.error.messages=FALSE)
> > > stop()
> > >
> > > which is what I believe you want....
> > >
> > > Jim
> >
> > also From Pierre Kleiber:
> >
> > The thing is that functions don't really stop... they return.
> >  So what
> > you want is return()
> >   Cheers, Pierre
>
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