[R] shading between two smoothed curves

[Jim Lemon]

Graves, Gregory wrote:
> I will attempt to distill my problem down to a simpler one, the solution of which will hopefully lead me to the nirvana of complete understanding, i.e., inserting a polygon beneath an irregular line terminated by the x axis.
>
> I 'know' that polygon will work -provided- I knew the xy coordinates of the line(s) beneath which I desire to create the polygon.  Unfortunately, I don't know how to get at that info.
>
> Below is an example of a irregular line for which the xy coordinates are not known (i.e., at least not by me).  I assume my problem boils down to finding out how to extract the xy from that line.  
>
> attach(cars)
> plot(dist ~ speed)
> scatter.smooth(speed, dist,family = "gaussian",span = .2)
>
>
>
>   
Hi Gregory,
That's right, just call the underlying function (loess.smooth) and use 
"str" on the result. There should be x and y components that can be 
passed to "lines".

Jim