example() leaves console prompting to press Enter for new graphs
On Jan 11, 2010, at 9:28 AM, Michael Friendly wrote:
Env: Win XP, R 2.9.2] It's a minor annoyance, but I find that after I run example(), the console state of prompting to press Enter for each new graph remains as it is under example. It's more annoying that it seems difficult to turn this behavior off!
I have had the same annoyance when I interrupted a sequence of examples with ctrl-C and this prevented the restoration of the initial state. You could try: options(device.ask.default = FALSE) # and / or grDevices::devAskNewPage(ask=FALSE) Changing the first one on my machine did nothing, but the second one was effective,
David.
>
> In a fresh session:
> > getOption("example.ask")
> [1] "default"
>
> Run an example:
> > example(plot)
> plot> require(stats)
>
> plot> plot(cars)
> Waiting to confirm page change...
> ...
>
> > getOption("example.ask")
> [1] "default"
>
> # do another plot:
> > plot(sin, -pi, 2*pi)
> Waiting to confirm page change...
> >
>
> # reset option to FALSE
> > options("example.ask"=FALSE)
> > plot(sin, -pi, 2*pi)
> Waiting to confirm page change...
>
> # try resetting devAskNewPage
> > devAskNewPage(ask = NULL)
> [1] TRUE
> > plot(sin, -pi, 2*pi)
> Waiting to confirm page change...
> >
>
> There does seem to be code in example to reset this state on exit,
> and I'm baffled why it doesn't actually
> do it
>
> ...
> if (ask == "default")
> ask <- echo && grDevices::dev.interactive(orNone = TRUE)
> if (ask) {
> if (.Device != "null device") {
> oldask <- grDevices::devAskNewPage(ask = TRUE)
> if (!oldask)
> on.exit(grDevices::devAskNewPage(oldask), add = TRUE)
> }
> op <- options(device.ask.default = TRUE)
> on.exit(options(op), add = TRUE)
> }
> ...
>
> So, how can I restore the previous state of plotting w/out prompting?
>
>
> --
> Michael Friendly Email: friendly at yorku.ca Professor, Psychology
> Dept.
> York University Voice: 416 736-5115 x66249 Fax: 416 736-5814
> 4700 Keele Street http://www.math.yorku.ca/SCS/friendly.html
> Toronto, ONT M3J 1P3 CANADA
>
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David Winsemius, MD
Heritage Laboratories
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