How about the following to plot only the 1,000 or so most extreem points
(the outliers):
x <- rnorm(1e6)
y <- 2*x+rnorm(1e6)
plot(x,y,pch='.')
tmp <- chull(x,y)
while( length(tmp) < 1000 ){
tmp <- c(tmp, seq(along=x)[-tmp][ chull(x[-tmp],y[-tmp]) ] )
}
points(x[tmp],y[tmp], col='red')
now just replace the initial plot with a hexbin or contour plot and you
should have something that takes a lot less room but still shows the
locations of the outer points.
Greg Snow, Ph.D.
Statistical Data Center
[EMAIL PROTECTED]
(801) 408-8111
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