Peng Yu
2009-Aug-23 00:36 UTC
[R] How to generate an error message when 'match' does not find any matches?
Hi,> match(4, c(1,2,3))[1] NA The above code run smoothly. It would not stop when 4 does not mach in c(1,2,3). I am wondering if there is a way to stop the code and pop up an error message immediately. This capability to stop will make debugging easier. Regards, Peng
Henrique Dallazuanna
2009-Aug-23 00:44 UTC
[R] How to generate an error message when 'match' does not find any matches?
Try this:
m <- match(4, c(1,2,3))
ifelse(is.na(m), stop("Not Found"), m)
Or:
stopifnot(!is.na(m))
On Sat, Aug 22, 2009 at 9:36 PM, Peng Yu <pengyu.ut@gmail.com> wrote:
> Hi,
>
> > match(4, c(1,2,3))
> [1] NA
>
> The above code run smoothly. It would not stop when 4 does not mach in
> c(1,2,3). I am wondering if there is a way to stop the code and pop up
> an error message immediately. This capability to stop will make
> debugging easier.
>
> Regards,
> Peng
>
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--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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