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

[akshay kulkarni]

Dear Iris,
                THanks a lot...

Thanking you,
Yours sincerely,
AKSHAY M KULKARNI
________________________________
From: Iris Simmons <ikwsimmo using gmail.com>
Sent: Wednesday, April 19, 2023 11:22 PM
To: akshay kulkarni <akshay_e4 using hotmail.com>
Cc: R help Mailing list <r-help using r-project.org>
Subject: Re: [R] running a function repeatedly on error....

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 attempt[[elided Hotmail spam]]

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