[R] shadow between two lines in plot()

[Jim Lemon]

Ding, Rebecca wrote:
>  Dear R users,
> 
> I used the following code to draw a scatter plot. 
> 
> plot(x,y,type="n")
> points(x,y,pch=1)
> 
> And then I used the abline functions to draw two lines. I want to add
> the shadow between those two lines. 
> 
> abline(h=200)
> abline(h=300)
> 
> Any suggestions?
> 
Hi Rebecca,
Have a look at polygon.shadow in the plotrix package. You can display a 
shadow-like figure based on any polygon.

Jim