[R] Ploting NA location points

[Peter Malewski]

On Thu, 10 Aug 2000, Kenneth Cabrera wrote:

> Hello, to everybody!
> 
> Can anybody help me with this problem?
> 
> How can I plot a x,y coordinates, but to plot a "z" variable
> with a different color if it is a z missing value (NA)?

e.g.

y <- rnorm(10)
x <- rnorm(10)
z <- x
z[c(2,4)] <-NA
plot(x,y)
points(x[is.na(z)] , y[is.na(z)] ,col=2)

best wishes 
Peter

btw: you can use rug to visualize points that are NA at x or y.

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