[R] Help with try or tryCatch

[David Scott]

On Mon, 31 Oct 2005, McGehee, Robert wrote:

> It sounds like you want `try` with the argument `silent = TRUE`. This
> will allow you to keep running your program without errors. If you want
> to check if the line had an error, you can error control by seeing if
> the class of the resulting object is "try-error". For example, let's say
> I wanted to make an error-proof `plus` function, such that trying "a" +
> 2 would result in NA instead of an error.
>
> newPlus <- function(x, y) {
> 	answer <- try(x + y, silent = TRUE)
> 	if (class(answer) == "try-error") return(NA) else return(answer)
> }
>

This approach worked. I had to define a test function of this sort outside 
of the loops and then call it within the loops with appropriate parameter 
values. Thanks for the assistance.

David Scott


-------------------------------------------------------
David Scott	Department of Statistics, Tamaki Campus
 		The University of Auckland, PB 92019
 		Auckland	NEW ZEALAND
Phone: +64 9 373 7599 ext 86830		Fax: +64 9 373 7000
Email:	d.scott at auckland.ac.nz


Graduate Officer, Department of Statistics