R help - Mar 2011 - Plotting Finite Element and Finite Difference Results together

As a simplification of a much larger problem, I'm using the following simple
example to explore ways of getting the finite difference results to plot
over the same extents as the finite element solution (see figure).  I
haven't discovered (if it exist) a way of getting the finite difference data
to extrapolate, perhaps I'm using the wrong plotting tool?

FD.dat<-matrix(c(1,3.5,3.5,1,
                 1,2.5,2.5,1,
                 1,1.5,1.5,1,
                 1,1,1,1),
               nrow=4,ncol=4,byrow=TRUE)

FE.dat<-matrix(c(1,1,4,1,1,
                 1,1,3.5,1,1,
                 1,1,2.5,1,1,
                 1,1,1.5,1,1,
                 1,1,1,1,1),
               nrow=5,ncol=5,byrow=TRUE)

FD.x.coords<-c(0.5,1.5,2.5,3.5)
FE.x.coords<-c(0,1,2,3,4)
FD.y.coords<-FD.x.coords
FE.y.coords<-FE.x.coords

contour(FD.x.coords,FD.y.coords,FD.dat,xlim=c(0,4),ylim=c(0,4))
contour(FE.x.coords,FE.y.coords,FE.dat,xlim=c(0,4),ylim=c(0,4),add=T,col="red")


http://r.789695.n4.nabble.com/file/n3388485/Slide1.png 

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