[R] Lattice graphics: adding lines to a plot
Matthew Walker
m.g.walker at massey.ac.nz
Thu Jul 29 12:53:47 CEST 2004
I am trying to use the Lattice package to produce the same result as I
can with the base graphics.
With base graphics I can type:
x <- 1:100
y <- x+rnorm(length(x))
g <- lm( y ~ x )
model.y <- g$coef[1]+g$coef[2]*x
plot(x,y) # a plot of the data
lines( x, model.y ) # a plot of the model, superimposed on the first plot
With Lattice graphics I've got this far:
library(lattice)
plot1 <- xyplot(y ~ x)
plot2 <- xyplot(model.y ~ x, panel = function(x, y) { llines(x=x, y=y) })
print(plot1, more=TRUE, position=c(0,0.5,1,1))
print(plot2, position=c(0,0,1,0.5))
But this just produces two graphs, one above the other. How do I
overlay them? What should I be doing in order to get the same result as
with the base graphics?
Thank you for your thoughts,
Matthew Walker
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