I wish to create a multipanel plot (map) from several datasets ("d" and "q" in the example below). I can condition the main xyplot statement on the "site" variable, but I don't know how to pass a conditioning variable to panel.xyplot plot so that the x-y coordinates from dataset q are only plotted at the appropriate site.
library(lattice) d <- data.frame(site = c(rep("A",12), rep("B",12)), x=rnorm(24),y=rnorm(24)) # Create dataframe "d", with 12 x-y coordinates for each site q <- data.frame(site = c(rep("A",7), rep("B",7)), x=rnorm(14),y=rnorm(14)) # Create dataframe "q", with 7 pairs of x-y coordinates for each site. mypanel <- function(...){ panel.xyplot(q$x, q$y, col="red") # Statement that needs a "Site" conditioning variable panel.xyplot(...)} xyplot(y~x|site, d, panel=mypanel) # Statement erroneously plots all 14 x-y points in "q" on panels for sites A & B Dr. Seth W. Bigelow Biologist, USDA-FS Pacific Southwest Research Station 1731 Research Park Drive, Davis California [[alternative HTML version deleted]] ______________________________________________ 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.