Greets,

I'm using a data frame that looks like:
> head(pr2)
  X1   X2 X3 X4    Y      fit       res
1 44 33.2  5 30 41.2 39.22201  1.977991
2 43 33.8  4 41 31.7 38.48476 -6.784761
3 48 40.6  3 38 39.4 44.78278 -5.382783
4 52 39.2  7 48 57.5 51.48134  6.018656
5 71 45.5 11 53 74.8 68.25585  6.544153
6 44 37.5  9 65 59.8 53.27743  6.522569

Along with the command:
> contourplot(Y~X1*X2,data=pr2)

But I get a blank plot. I thought it might be because the data were unsorted or sparse, so I made another ordered data frame as follows:

> head(new)
  X1 X2 X3 X4       resp
1  1  1  1  1 -10.810406
2  2  2  2  2  -7.657712
3  3  3  3  3  -4.505018
4  4  4  4  4  -1.352323
5  5  5  5  5   1.800371
6  6  6  6  6   4.953065

But the result is the same. Any idea why this does not work?

Best Regards,
Steven
 
	[[alternative HTML version deleted]]

