Thanks Bert. I’ll check it out. Don
On Nov 22, 2013, at 10:25 PM, Bert Gunter <gunter.ber...@gene.com> wrote: > 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 Don McKenzie Research Ecologist Pacific WIldland Fire Sciences Lab US Forest Service Affiliate Professor School of Environmental and Forest Sciences College of the Environment 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.
