On 9/19/06, Prof Brian Ripley <[EMAIL PROTECTED]> wrote: > On Tue, 19 Sep 2006, Kjetil Halvorsen wrote: > > > This is from R-2.4.0alpha on windows XP, downloaded from CRAN yesterday. > > > > I did > > update.packages(destdir= ..., ask=FALSE,checkBuilt=TRUE) > > > > which took quite a long time (as.expected). When the internet cafe > > had to close, I had to stop the downloading, but the menu item > > misc --- stop current computation only stopped the current download, > > and then R imeadiaetely continued whit the next in the waitin list, so I had > > to kill > > R. I would be nice if this could be corrected so it really > > stopped all the waiting computastion! > > As it does what it says, it cannot be 'corrected' to do something else. > I usually find hitting Ctrl-C (or ESC in Rgui) a few times breaks out > here. > > The issue is that update.packages (or more precisely download.packages) > has a loop of try() constructs, and those are trapping interrupts. > I don't think there is any way to distinguish those from other internal > errors. In any case, it is a somewhat delicate question as to what you > want: do you want pending on.exit() actions done, for example?
Without digging into the update.packages() et al code, wouldn't a distinction between 'error' and 'interrupt' using tryCatch() rather than try() solve this? ...assuming "stop current computation" signals some kind of interrupt. Some additional thoughs: It would be very useful if we could define different 'condition' classes that can be caught or let through using tryCatch(). Then higher-level methods such as source() and example() can then be made sensitive to these. For example: simpleExit extends simpleCondition: A script can throw this to signal to example() or source() that it want to exit the evaluation nicely, cf. stop(). See also R-devel topic "[Rd] New simpleExit() condition (Was: Re: Can example() code stop the example without generating an error?)" on March 14, 2006. /Henrik > > -- > Brian D. Ripley, [EMAIL PROTECTED] > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
