Retry for-loop R loop if error

Question

I have an R For loop that downloads data from a server and adds result to table however, I sometimes get an error stopping the loop. If I tell it to redo the last download a

Answer 1

You could throw a try-catch combo.

for (i in 1:1000){
    while(TRUE){
       df <- try(downloadfnc("URL", file = i), silent=TRUE)
       if(!is(df, 'try-error')) break
    }
    table[i,] <- df
}

This will continue within the while loop until the file is successfully downloaded, and only move on when it is successfully downloaded.