Jim Lemon wrote:
Seth W Bigelow wrote:
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.
Hi Seth,
Maybe you could use the stackpoly function in the plotrix package:
x<-matrix(x,nrow=10)
y<-matrix(y,nrow=10)
stackpoly(x,y,stack=TRUE)
Jim
Also see the filled bands option in the xYplot function in the Hmisc
package.
Frank
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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