Use the Rcolorbrewer package. -- Bert
On Fri, Nov 22, 2013 at 8:43 PM, Don McKenzie <d...@u.washington.edu> wrote: > I would like to produce a levelplot with divergent colors such that > increasingly negative values of Z get darker in the first color and > increasingly > positive values get darker in the second color. this is common in > cartography. I have tried tinkering with the col.regions argument but the > best I can do > is to get the split in the middle of my range of Z, but in my particular case > range(Z) is (-1,12). > > I am using R 3.0.2 on OSX 10.9 > > Here is an example > > x <- y <- c(1:25) > grid <- expand.grid(x=x,y=y) > grid$z <- sort(runif(625,min=-1,max=12)) > levelplot(z ~ x*y,grid) # produces the default pink and blue but the split > is at ~5.5 > > # do something clever here > # e.g., my.colors <- <create a palette that splits at zero> > > levelplot(z ~ x*y,grid,col.regions=my.colors) # so there should be some > light pink at the bottom and the rest increasingly intense blue > > Ideas appreciated. Thanks in advance. > > > > Don McKenzie > Research Ecologist > Pacific Wildland Fire Sciences Lab > US Forest Service > > Affiliate Professor > School of Environmental and Forest Sciences > University of Washington > > d...@uw.edu > > ______________________________________________ > R-help@r-project.org mailing list > 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. -- Bert Gunter Genentech Nonclinical Biostatistics (650) 467-7374 ______________________________________________ R-help@r-project.org mailing list 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.
