[R] Equal number of cuts in a contourplot with trellis
Jesus Frias
Jesus.Frias at dit.ie
Thu Jan 12 11:32:53 CET 2006
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 http://www.dit.ie/DIT/tourismfood/science/
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