It could be approximated with line segments, using the segments function.

Something like two calls similar to
   segments(x,x^2, x, 0.5*x^2)

one call where f > g, the other call f < g, using a different value for the 'col' argument

Make x very dense, say seq(1,100,len=1000) instead of 1:100, and it will look like it's filled.

-Don

At 2:16 PM -0400 4/19/04, ivo welch wrote:
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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--
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA

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