Too many curly braces. warning and error need to be arguments to tryCatch.
On February 7, 2021 11:30:59 AM PST, p...@philipsmith.ca wrote:
>I need help using the tryCatch function. I have a function and I want
>to
>surround it with tryCatch to catch errors and thereby avoid stopping
>execution of my program if the function fails. In my reproducible
>example below I have used a very simply function that just adds two
>numbers together. My function, called Adn, compiles, but when executed
>it generates the message: "Error in tryCatch({ : condition handlers
>must
>be specified with a condition class". I do not understand the error
>message.
>
># Reproducible example for using tryCatch
>
>Adn <- function(x,y) {
> out <- tryCatch(
> {
> x+y
> },
> {
> warning = function(cond) {
> message("There was a warning.")
> message("Here is the original warning message:")
> message(cond)
> return(100)
> }
> },
> {
> error = function(cond) {
> message("There was an error.")
> message("Here is the original error message:")
> message(cond)
> return(200)
> }
> },
> finally = {
> message("Error handling done.")
> }
> )
> if (out==100 | out==200) { z <- 0 }
> else { z <- x+y }
> return(z)
>}
>(result <- Adn(1,sqrt(2))) # should work fine
>(result <- Adn(1,sqrt(-2))) # should catch a warning and set z to 0
>(result <- Adn(1,"a")) # should catch an error and set z to 0
>
>______________________________________________
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>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
--
Sent from my phone. Please excuse my brevity.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
