[R] running a function repeatedly on error....

[Iris Simmons]

I might try something like this:

FUN1 <- function ()
{
    threshold <- 4L
    fails <- 0L
    internal <- function() {
        ## do the actual downloading here
        tryCatch({
            download.file(<...>)
        }, error = function() {
            fails <<- fails + 1L
            if (fails >= threshold) stop("unable to download file(s)")
            internal()
        })
    }
    internal()
}

which should attempt to download the files, stopping after 4 failed
attempts. I hope this helps!

On Wed, Apr 19, 2023, 12:57 akshay kulkarni <akshay_e4 using hotmail.com> wrote:

> Dear members,
>                           I have a function FUN1 that downloads some data
> from the internet. It so happens that the function doesn't work the first
> time, but on the second or third attempt it works. I want to run the
> function repeatedly for four times if it throws an error:
>
> X <- tryCatch(FUN1, error = function(c) {FUN1})
>
> This runs the function two times. But I want to run the function four
> times if throws an error, but on the fifth attempt if it throws an error,
> abort. I know I can include the tryCatch call inside FUN1 and call it, but
> any short and elegant code to that effect?
>
> Thanking you,
> Yours sincerely
> AKSHAY M KULKARNI
>
>
>
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>
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