I wish to have inward-pointing ticks on my contourplot graph, but the
colored background produced by the "region=TRUE" statement covers the
ticks up, is there any way around this? Sample code below. --Seth
library(lattice)
model <- function(a,b,c,d,e, f, X1,X2) # provide model function
for contour plot
{J <- a + (b*X1) + (c*X2) + (d*X1*X2) + e*(X1^2) + f*(X2^2)
pp <- exp(J)/(1+exp(J))
return(pp)}
g <- expand.grid(X1= seq(0.3,0.9,0.001), X2 = seq(0.3,1, 0.001))
g$z <- model(-29, -14, 52, 80, -3, -56, g$X1, g$X2) # Create
variable z using gridded data, model, and variables
contourplot(z ~ X1 * X2,
data = g,
region = TRUE, # Adds color to background
cuts = 10, # Number of contour intervals...(and color
intervals!)
scales = list(tck = c(-1,-1)) # ticks go inward
) ### END
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