Help with try or tryCatch

From: 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