[R] error options

[Bert Gunter]

Below.

-- Bert

On Wed, Dec 28, 2011 at 11:35 AM, Paul Murtaugh
<murtaugh at science.oregonstate.edu> wrote:
> Hi,
>
> I'm running simulations that include a function that occasionally fails
> because of an unpredictable singularity in a matrix that it tries to invert.
> I'd like to have the function return 'NA' when that happens, so that the
> simulations can continue.  I've tried things like:
>
>   test <- function() {
>   options(error=return(NA))
>   x <- solve(0)
>   return(x)
>   }
>
> which does return 'NA'.  But it returns 'NA' whether or not there's an
> error in the function:
>
>   test <- function() {
>   options(error=return(NA))
>   x <- 0
>   return(x)
>   }
>
>   test()
>   [1] NA
>
> What am I missing here?

error trapping.
?try   ##or
?tryCatch

-- Bert

>
> Thanks in advance
> -Paul
>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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