[R--gR] Help needed using lattice for area plots lpolygon, xyplot.

[Achim Zeileis]

Toby,

this is the SIG for "graphical models" which is not concerned with
"graphics". It would be more appropriate (and more likely to generate
answers) to ask this question on R-help.

Best,
Z

> I am trying to learn how to use the graphics from the lattice package
> ( and am very new to R). 
>
> I am trying to replicate the example plot referenced below, by using
> the lattice xyplot & lpolygon to create panels.  I get what appears
> to be the correct shape of the filled region, but cannot get the
> position to overlay properly.  I have attempted with various settings
> of position.  ( i.e. position = c(0,0,1,1)  etc settings as well.   I
> am not understanding something about the positioning panels.  I am
> missing some subtle difference between polygon & lpolygon, or am
> missing something about panel overlays &/or panel postions.
> 
> #http://addictedtor.free.fr/graphiques/graphcode.php?graph=7. 
> par(bg="white") 
> n <- 100
> set.seed(43214) #just so we have the same exact graph
> x <- c(0,cumsum(rnorm(n))) 
> y <- c(0,cumsum(rnorm(n))) 
> xx <- c(0:n, n:0)
> yy <- c(x, rev(y)) 
> plot(xx, yy, type="n", xlab="Time", ylab="Distance") 
> polygon(xx, yy, col="gray") 
> title("Distance Between Brownian Motions") 
> 
> 
> 
> # using lattice.
> p1 <- xyplot( yy~xx,type='l');
> p2 <- lpolygon(xx,yy,col='blue');
> print(p1,position=c(0,0,1,1), more=TRUE);
> print(p2,position=c(0,0,1,1));
> 
> 
> 
> 
> 
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