R and plot.variogram

[Willem Vervoort]

Hi all
I am using R 1.8.0 under Windows XP
I have installed gstat from CRAN
I am having problem ploting the variograms
vgm1<-variogram(clay~x+y, loc=~x+y, PC.spdata,witdh=cutoff/50)


tmp<-fit.variogram(vgm1,vgm(1,"Sph",300,1),print.SSE=TRUE)


[1] "SSErr:  31366.3780209903"

All this works

plot.variogram(vgm1,model=vgm(1,"Sph",300,1))


Error in if (x$output.type == "bin") Ldots$type <- "p" :
      argument is of length zero
In addition: Warning message:
no finite arguments to max; returning -Inf
?plot.variogram


The help text is there!

plot.variogram(vgm1)


Error in if (x$output.type == "bin") Ldots$type <- "p" :
      argument is of length zero
In addition: Warning message:
no finite arguments to max; returning -Inf
Not good, I seem to think it has to do with me. Am I getting the class 
of my data right? The data is pretty simple:

PC.spdata[1:10,]


  x   y  clay  sand fsand   EC      McN      Tikh

1   0 0.5 49.49 34.19 28.27  266 198.3690 126.33059

2   0 1.5 47.65 28.75 25.06  911 288.6718 124.15259

3   0 2.5 56.88 26.41 18.78 1251 315.1554 121.83433

4   0 3.5 61.94 25.00 16.33 1140 302.2132 119.25082

5   0 4.5 65.02 21.75 12.62 1188 273.8793 116.30404

6   0 5.5 59.79 24.61 13.97 1112 244.8895 112.92241

7   0 6.5 61.01 21.72 12.38 1046 220.6816 109.05847

8   0 7.5 43.58 52.30  8.54  725 206.2891 104.68629

9   0 8.5 51.16 47.36  7.38  713 206.7454  99.79917

10 50 0.5 48.10 33.34 27.96  253 157.0218 102.49656

This is a data.frame. ?spatial.data.frame gives error

Any clues would be appreciated

Regards
Willem Vervoort
--
Dr R.W. Vervoort
McCaughey Senior Lecturer Hydrology and Catchment Management                    
Faculty of Agriculture, Food and Natural Resources
Rm 503, Watt Bldg.
http://www.agric.usyd.edu.au/mccaughey
Postal:
Bldg A03
The University of Sydney, NSW, 2006
phone: +61 (2) 9351 8744
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