[R] Equal number of cuts in a contourplot with trellis

Dear R-helpers, I need some help to produce a set of contour plots that I am trying to make in order to compare surfaces between the levels of a factor. For example: library(lattice) g - expand.grid(x = 60:100, y = 1:25, ti = c(a,b,c)) g$z -with(g, (-1e-4*x-1e-3*y-1e-5*x*y)*(ti==a) +

Re: [R] Equal number of cuts in a contourplot with trellis

On 1/12/06, Jesus Frias [EMAIL PROTECTED] wrote: Dear R-helpers, I need some help to produce a set of contour plots that I am trying to make in order to compare surfaces between the levels of a factor. For example: library(lattice) g - expand.grid(x = 60:100, y = 1:25, ti = c(a,b,c))