[R] Scatter Plot in R - Help

[John Kane]

Here is a recent posting by Petr Klasterecky  that
does not seem to be on the archive yet that may help.
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What do you mean by background? Maybe this is enough:

plot(seq(-3,3,.01), dnorm(seq(-3,3,.01)), type="n",
xlab="x", 
ylab="f(x)", main="Normal density")
polygon(x=c(-4,0,0,-4), y=c(-1,-1,.5,.5), col="red")
polygon(x=c(4,0,0,4), y=c(-1,-1,.5,.5), col="blue")
lines(seq(-3,3,.01), dnorm(seq(-3,3,.01)), type="l",
lwd=2)

Play a little bit with the polygon margins to get what
you need. You 
can 
even generate them automatically based on your data.

Petr
-----------------------------------------------
--- A Ezhil <ezhil02 at yahoo.com> wrote:

> Dear All,
> 
> I am using the following commands to do the scatter
> plot of two vectors, say X and Y.
> 
> plot(X,Y, col="blue")
> abline(a=1,b=1, col="red")
> abline(a=-1,b=1, col="green")
> 
> I would like to split the scatter plot into 3 part
> with 3 different colors: (i) points lies between 2
> lines, (ii) points above line 1, and (iii) points
> below line 2. I am struggling to do this. I would
> greatly appreciate any help in doing this.
> 
> Thanks in advance.
> 
> Kind regards,
> Ezhil
> 
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