On May 2, 2009, at 7:00 PM, Alex Reynolds wrote:

How would I set the "scales" property of a lattice levelplot, so that I can add specific annotations at specific positions?

For example, I have a 200 x 1000 element levelplot. Along the y-axis (along the 1000-element axis) I would like to add annotations on the left side of the levelplot at elements 120, 300, 500, and 805, which represent clusters of interest.

Currently I have no annotations in my "scales" property:

colorFun <- colorRampPalette(c("white","black"))
myLevelplot <- levelplot(
        t(scale(set.allElements))[,myLevelplot.dendrogram.order],
        scales=list(y=list(draw=F),x=list(draw=F)),
        colorkey=F, col.regions=colorFun, aspect="iso",
        xlab="", ylab="", main="test title",
        legend=(list(right=
                list(fun=dendrogramGrob,
args=list(x=myLevelplot.dendrogram, ord= myLevelplot.dendrogram.order,
                                side="right", size=15, size.add=0.0,
                                add=list(rect=list(col="transparent", 
fill=NA))))))
        )

Is there a straightforward way to add them?

Not sure since you have not provided a reproducible example and not really defined what "annotations" means. See if you can derive a more genral priciple by comparing with this example to the first example on hte levelplot help page:
x <- seq(pi/4, 5 * pi, length.out = 100)
y <- seq(pi/4, 5 * pi, length.out = 100)
r <- as.vector(sqrt(outer(x^2, y^2, "+")))
grid <- expand.grid(x=x, y=y)
grid$z <- cos(r^2) * exp(-r/(pi^3))
levelplot(z~x*y, grid, cuts = 50, scales=list(log="e", x=list(at=c(1,3.10)), y=list(at=c(1,10))), xlab="", ylab="", main="Weird Function", sub="with log scales", colorkey = FALSE, region = TRUE)



Thanks,
Alex

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David Winsemius, MD
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