[R] Coloring spaces between lines in xyplot

[Seth W Bigelow]

Ok, thanks to Carl Witthoft I now know that to color spaces between  and
below a pair of lines in xyplot, I will need to redefine the lines as
polygons, and use the lpolygon panel function, as in the following

library(lattice)
p <- c(1,10,10,1)       #  vector of x values
q <- c(4,29.2,16,2.5)          # vector of y values for upper polygon
r <- c(2.5,16,0,0)                    # vector of y values for lower
polygon

xyplot(
  q + r ~ p,
  panel = lpolygon,
  col = c("red","green")
  )

But, having spent several hours arriving at this increment of knowlege, I
find myself stumped at how to assign different colors to the two polygons!
the above "col" line did not do the job.

--Seth



Dr. Seth  W. Bigelow
Biologist, Sierra Nevada Research Center
Pacific Southwest Research Station, USDA Forest Service. 1731 Research Park
Drive, Davis CA 95618
sbigelow at fs.fed.us
www.fs.fed.us/psw/programs/snrc/staff/bigelow
www.swbigelow.net

Phone: 530 759 1718
Fax: 530 747 0241