I have data saved in files on disk in following format
x y z
------------------
1 1 1
1 2 2
2 1 3
2 2 4
Normally I read the file into a data frame, but suppose I do it this way:
x<-seq(1,2)
y<-seq(1,2)
z<-seq(1,4)
data<-data.frame(x,y,z)
image(unique(data$x),unique(data$y),data$z, col=gray(0:19/19),
xlab="x", ylab="y")
I was helped at some point in the past on image(). However I can't figure
out how to make a contour plot or a persp plot. The help pages don't give
an example similar to mine. Unfortunately Venables & Ripley don't
discuss
contour or persp either (and maybe S-Plus differs from R anyway).
Thanks very much for any help!
Bill Simpson
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