Try running this and see if it does what you want. It just uses plain
old plot with the cex arg for size and the col arg for colour...
greyDots <- function() {
# make up some data
x <- runif(50, 0, 10)
y <- runif(50, 0, 10)
valueMax <- 100
value <- sample(valueMax, 50)
# edit these to taste
maxDotSize <- 5
maxGreyLevel <- 0.8
plot(x, y, pch=16, xlim=c(0,10), ylim=c(0,10),
cex=maxDotSize * value / valueMax,
col=grey(maxGreyLevel * value / valueMax))
}
On 12 August 2010 13:14, Brian Tsai <btsa...@gmail.com> wrote:
> Hi all,
>
> I'm interested in doing a dot plot where *both* the size and color (more
> specifically, shade of grey) change with the associated value.
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