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") +

(1e-2*x-1e-3*y-1e-4*x*y)*(ti=="b") +

(1e-3*x-1e-3*y-1.e-5*x*y)*(ti=="c")

)

contourplot(z~ x * y|ti, data = g,

cuts=20,

pretty=T,

screen = list(z = 30, x = -60))

As you can see in the figure, most of the contour lines are in one of

the levels and we are not able to see how the other levels look like.

I would like to display the same number of cuts in each of the trellis.

I can make each of the contourplots separately and control the number of

cuts but I am not able to plot all of them in one.

Thanks in advance,

Jesus

Jesús María Frías Celayeta

School of Food Science and Environmental Health

Dublin Institute of Technology

Cathal Brugha St. Dublin 1

p + 353 1 4024459

f + 353 1 4024495

w

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