On 13-Jun-06 Erin Hodgess wrote: > Dear R People: > > I am using R for teaching purposes in a large classroom. > > Each computer has its own copy of R. > > However, every once in a while, about half of us will get > thrown out of R, for no apparent reason. > > By the way, it has happened in other classrooms as well. > > > Has anyone else run into this, please? > > If so, how have you solved this problem, please? > > Thanks in advance! > > R for Windows
Hmmm ... you're asking statisticans here! When it happens, is it at about the same moment for all the machines it happens on? Is the set of machines it happens on different every time, or do some seem to be systematically vulnerable? (As you can tell, I've not experienced this, but am groping for a mechanism. I find "once in a while, about half of us will get thrown out of R" puzzling as a phenomenon -- strongly suggestive of non-independence of machines, despite each machine having its own copy of R). Presumably they're networked. Might it be possible that (e.g.) a central server is re-profiling some of the machines from time to time (or similar)? If it's a group phenomenon, I'd be tempted to look either in the hardware direction (e.g. power fluctuation to which some machines are sensitive and get e.g. corrupt bytes in RAM leading to segfault or the like), or the software direction (e.g. interference from external server as above, or maybe one machine making a request to others over the net). Though each machine "has its own copy of R", does each one have its own copy of the full set of packages that you use? Or is there some sort of central repository for packages from which machines can pull down extras as they need them? Is there a central "monitoring" machine in the classrom for the instructor to use to collaborate with [groups of] students? Just random thoughts, really! But hoping that they may help. Best wishes, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <[EMAIL PROTECTED]> Fax-to-email: +44 (0)870 094 0861 Date: 13-Jun-06 Time: 21:29:59 ------------------------------ XFMail ------------------------------ ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
