plot.tile.list() expects its argument to be of class tile.list, and to have an attribute "rw", both of which are not conserved after subsetting. You can do ...
if (!require(deldir)) { install.packages("deldir") library(deldir) } x <- rnorm(10) y <- rnorm(10) del <- deldir(x, y) tl <- tile.list(del) tl2 <- tl[1:4] class(tl2) <- "tile.list" attr(tl2, "rw") <- attr(tl, "rw") plot.tile.list(tl2) # or just plot(tl2) BUT! This doesn't really make sense because you are just "randomly" plotting some tiles from the full triangulation, not plotting a triangulation with less points. That would be: plot(tile.list(deldir(x[1:4], y[1:4]))) Cheers, B. On Jan 14, 2015, at 10:13 AM, Bert Gunter <gunter.ber...@gene.com> wrote: > 1. Please in future specify the package (deldir here) that contains > the functions you refer to. > > 2. **Always** first try ?str before posting queries like this, as this > will often reveal the problem. > > str(tl[1:800]) > > 3. I would **guess** (ergo could well be wrong) that "[" is not > preserving the class attribute of tl. Ergo you are getting the basic > plot method and not the plot.tile.list method. > > HTH. > > Cheers, > > Bert > > Bert Gunter > Genentech Nonclinical Biostatistics > (650) 467-7374 > > "Data is not information. Information is not knowledge. And knowledge > is certainly not wisdom." > Clifford Stoll > > > > > On Wed, Jan 14, 2015 at 6:23 AM, Raphael Päbst <raphael.pae...@gmail.com> > wrote: >> Hello everybody! >> I feel very stupid right now but suspect it has something to do with >> tiredness. I am trying to drop the last couple of Elements from a list >> and this doesn't work as expected. >> >> My code looks something like this: >> >> del <- deldir(x, y) >> tl <- tile.list(del) >> plot(tl) >> >> Now, I only want to plot the first 800 elements of tl and can't work >> out how to do this. >> plot(tl[1:800]) >> gives me an error "x is a list but does not have components x and y" >> which somewhat baffles me. I'm sure this is all due to lack of sleep >> but right now I feel very dumb and would welcome any pointers towards >> a solution for my problem. >> >> Many thanks! >> >> Raphael >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.