[R] Contour - data points not in ascending order?

[Kirkeby]

Hi again.

I have made an example of my data:

x<-c(1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4) 
y<-c(1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4)
z <- c(12,23,23,42,12,1,1,32,5,45,65,76,32,21,23,43)
data <- unique(cbind(x,y,z))
contour(x,y,z, col="red", xlim=c(0,1), ylim=c(0,1), labcex=0.7, cex="12")

-which gives an error message.

/CK 

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