Thank you for all your answers, this really helped me out. I've been digging into scoping rules in R and although I'm going to need quite some more studying to fully grasp it, I do see where the errors come from.
Thanks again. @Erik : I know that some_value was not declared. I just gave some pseudo-code to illustrate the general pattern of the errors, to indicate why I thought they were linked. Sorry if I wasn't clear enough on that one. Cheers Joris On Fri, Oct 1, 2010 at 7:21 PM, Erik Iverson <er...@ccbr.umn.edu> wrote: > > > Joris Meys wrote: >> >> Dear, >> >> I'm following the r tag on stackoverflow.com, and couldn't but notice >> there are quite some questions popping up that deal with scoping in >> relation to custom functions. I grinded my teeth on it already, and I >> have absolutely no clue what goes wrong. The general pattern is as >> follows : >> >> ff <- function(x){ >> y <- some_value >> some_function(y) >> } >> >>> ff(x) >> >> Error in eval(expr, envir, enclos) : object 'y' not found > > I get: > > Error in ff(x) : object 'some_value' not found > > which is entirely consistent, since it has not been bound to a value. > > > >> >> I tried to report this as a bug earlier, but got the message I used >> the wrong channel. I also don't know how to formalize it into a bug >> report on the report site. That's why I bring it to your attention >> this way, and want to ask you whether this is by design and we're all >> doing something wrong, whether these are problems within certain >> packages/situations, ... >> >> I solve these problems now by adding an environment to my global >> environment, and delete it after the function finished running. But >> this can't be the correct way. >> >> The problem is described here : >> >> http://stackoverflow.com/questions/3840769/scoping-and-functions-in-r-2-11-1-whats-going-wrong >> >> Links to different reports, all having that same pattern but with >> different functions : >> >> >> http://stackoverflow.com/questions/3742415/r-statistical-scoping-error-using-transformby-part-of-the-doby-package >> >> http://stackoverflow.com/questions/3768417/how-to-use-acast-reshape2-within-a-function-in-r >> >> http://stackoverflow.com/questions/3661500/why-cant-i-pass-a-dataset-to-a-function >> >> http://stackoverflow.com/questions/3574858/values-not-being-copied-to-the-next-local-environment >> >> http://stackoverflow.com/questions/2646402/using-functions-and-environments >> >> > -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel