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 [EMAIL PROTECTED] www.fs.fed.us/psw/programs/snrc/staff/bigelow www.swbigelow.net Phone: 530 759 1718 Fax: 530 747 0241 ______________________________________________ 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.