Friends: I wish to overlay data points on a contour graph. The following
example produces a nice contour plot, but I have not mastered the concept
of using panel functions to modify plots. Can someone show me how to
overlay the data points (given after contour plot statement) on the
contourplot?
On 12/13/07, Seth W Bigelow [EMAIL PROTECTED] wrote:
Friends: I wish to overlay data points on a contour graph. The following
example produces a nice contour plot, but I have not mastered the concept
of using panel functions to modify plots. Can someone show me how to
overlay the data points
Hi Seth,
An alternative would be to use ggplot2, http://had.co.nz/ggplot2:
model - function(a,b,c,X1,X2) {
(exp(a + b*X1 + c*X2)) / (1 + exp(a + b*X1 + c*X2))
}
g - expand.grid(X1 = seq(0.40, 0.8,0.01), X2 = seq(0.03,0.99,0.03))
a - -37.61
b - 34.88
c - 28.44
g$z- model(a, b, c, g$X1,g$X2)
Deepayan:
Very nice, thanks for introducing me to a new resource. I will include the
entire, functioning example in the event others may find it useful.
--Seth
## Sample code for overlaying data points on a contour graph, using
xyplot and contourplot ##
library(lattice)
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