Berwin A Turlach wrote: > G'day Peter, > > On Thu, 05 Mar 2009 09:09:27 +0100 > Peter Dalgaard <p.dalga...@biostat.ku.dk> wrote: > >> rha...@stat.purdue.edu wrote: >>> <<insert bug report here>> >>> >>> This is a CRITICAL bug!!! I have verified it in R 2.8.1 for mac >>> and for windows. The problem is with loess degree=0 smoothing. >>> For example, try the following: >>> >>> x <- 1:100 >>> y <- rnorm(100) >>> plot(x, y) >>> lines(predict(loess(y ~ x, degree=0, span=0.5))) >>> >>> This is obviously wrong. >> Obvious? How? I don't see anything particularly odd (on Linux). > > Neither did I on linux; but the OP mentioned mac and windows. > > On windows, on running that code, the lines() command added a lot of > vertical lines; most spanning the complete window but some only part. > > Executing the code a second time (or in steps) gave sensible > results. > > My guess would be that some memory is not correctly allocated or > initialised. Or is it something like an object with storage mode > "integer" being passed to a double? But then, why doesn't it show on > linux? > > Happy bug hunting. If my guess is correct, then I have no idea how to > track down such things under windows..... > > Cheers, > > Berwin > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel
Please can you folks try under R-devel (to be R-2.9.0 in a couple of weeks) and report if you still see it. I do not under R-devel (but do under R-release), so my guess is that something called by loess() has been fixed in the meantime. Moreover it is not the plot stuff that was wrong under R-2.8.1 (release) but the loess computations. Uwe Ligges ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
