I'm reading Ripley-Venables "Modern Applied Statistics with S - Fourth edition" , at
the same time trying the examples proposed in the book using R 1.8.1 under linux.
Now I'm trying the following code from the book (example code of spatial statistics
at page 76) with R :
| data(topo) library("spatial") topo.loess<-loess(z ~ x * y, topo,
| degree= 2,span=0.25)
| topo.mar<-list(x=seq(0,6.5,0.2),y=seq(0,6.5,0.2))
| topo.lo=predict(topo.loess,expand.grid(topo.mar))
| par(pty="s")
|
contour(topo.mar$x,topo.mar$y,topo.lo,xlab="",ylab="",levels=seq(700,1000,25),cex=0.7)
and at the "contour" command the following error pops up:
Error in contour.default(topo.mar$x, topo.mar$y, topo.lo, xlab = "",
ylab = "", :
~ no proper `z' matrix specified
Being an R newbye I don't know what to do next to fix the problem.
Regards
Vittorio from Rome
______________________________________________
[EMAIL PROTECTED] mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
