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.
