[R] fill between lines

[Liaw, Andy]

Nothing easily that I can think of.  You need to plot each `piece'
separately using polygon().  I.e.,

1. Find the `pieces'.
2. Determine the color the piece should be in.
3. Draw the piece with polygon().

Step 1 above is probably the trickiest part, but quite doable, I think.

Best,
Andy

> From: ivo welch
> 
> hi:  is it possible to color areas between two functions?  
> for example,
> 
>     x<- 1:100;
>     plot(x, x^2, type="l");
>     lines(x,0.5*x^2, type="l");
>     # better
>     plotwithfill(x, x^2, 0.5*x^2, color=c("yellow", "red");
> 
> where the first color is used if f(x)=x^2 > g(x)=0.5*x^2, and 
> the second 
> for the reverse.  Help appreciated.
> 
> Regards, / ivo
> 
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