R: Run a function in batch mode

batch {svMisc}

R Documentation

Run a function in batch mode

Description

A function can be run in batch mode if it never fails (replace errors by warnings) and return TRUE in case of success, or FALSE otherwise.

Usage

batch(items, fun, ..., show.progress = !isAqua() && !isJGR(),
    suppress.messages = show.progress, verbose = TRUE)

Arguments

`items`	the items (usually, arguments vector of character strings) on which to apply `fun` sequentially.
`fun`	the function to run (must return `TRUE` or `FALSE` and issue only warnings and messages to be a good candidate, batchable, function).
`...`	further arguments to pass the `fun`.
`show.progress`	do we show progression as item x on y... message? This uses the `progress()` function.
`suppress.messages`	are messages from the batcheable function suppressed? Only warnings will be issued. Recommended if `show.progress = TRUE`.
`verbose`	display start and end messages if `TRUE` (default).

Author(s)

Philippe Grosjean <phgrosjean@sciviews.org>

Examples

## Here is a fake batcheable process
fakeProc <- function (file) {
    message("Processing ", file, "...")
    flush.console()
    Sys.sleep(0.5)
    if (runif(1) > 0.7) { # Fails
        warning("fakeProc was unable to process ", file)
        return(invisible(FALSE))
    } else return(invisible(TRUE))
}

## Run it in batch mode on five items
files <- paste("file", 1:5, sep = "")
batch(files, fakeProc)