You could use local() to associate a state variable with your function:
myFunc <- local({
notWarnedYet <- TRUE
function(x) {
if (notWarnedYet) {
warning("myFunc is funky")
notWarnedYet <<- FALSE # note use of <<-
}
sqrt(log2(x))
}
})
E.g.,
> myFunc(1:5)
[1] 0.000000 1.000000 1.258953 1.414214 1.523787
Warning message:
In myFunc(1:5) : myFunc is funky
> myFunc(1:5)
[1] 0.000000 1.000000 1.258953 1.414214 1.523787
> myFunc(1:5)
[1] 0.000000 1.000000 1.258953 1.414214 1.523787
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Mon, Aug 25, 2014 at 2:05 PM, Berry Boessenkool
<berryboessenk...@hotmail.com> wrote:
>
> Hi,
>
> I'm writing a function that gives a warning in a certain scenario.
> Reading this once per R session will be enough.
> i.e. it's not necessary to be shown in subsequent function calls.
>
> What's the best way to implement this?
> Some package-specific option?
> Where would I find good information on that?
>
> searching with the keywords I'm using as the subject of this message didn't
> dig up any results.
> Maybe it will be enough to give me some better keywords...
>
> Thanks ahead,
> Berry
>
> RclickHandbuch.wordpress.com
>
>
>
> ______________________________________________
> R-help@r-project.org mailing list
> 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.
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
