How to remove the second order trend in gstat?

Have you tried the option "degree = 2" in gstat? ?gstat reads "degree:
order of trend surface in the location, between 0 and 3"

Cheers,

Thierry

PS A working sample of your code makes it be easier to give you
feedback.

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be 

Do not put your faith in what statistics say until you have carefully
considered what they do not say.  ~William W. Watt
A statistical analysis, properly conducted, is a delicate dissection of
uncertainties, a surgery of suppositions. ~M.J.Moroney

-----Oorspronkelijk bericht-----
Van: Yong Li [mailto:yong.li at unimelb.edu.au] 
Verzonden: dinsdag 24 april 2007 6:44
Aan: r-sig-geo at stat.math.ethz.ch
Onderwerp: [R-sig-Geo] How to remove the second order trend in gstat?

Dear all,

I can remove the linear trend by using ~x+y in gstat, but 
have no idea to cope with the second order trend. Any help 
will be appreciated.

Cheers,

Yong Li