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Hello,
I'm trying to play with the universal kriging
example, and using the code as specified in the demos folder, but i get the
follwing error message:
> x <- krige(log(zinc) ~ -1 + sqrt(dist)+
part.a + part.b,
+ ~ x + y, meuse, meuse.grid, + model = vgm(.149, "Sph", 700, .0674)) Error in eval(expr, envir, enclos) : Object "part.a" not found Trying to fix it with the following solved that
problem, but gave me another:
> x <- krige(log(zinc) ~ -1 +
sqrt(meuse.grid$dist)+ meuse.grid$part.a + meuse.grid$part.b,
+ ~ x + y, meuse, meuse.grid, + model = vgm(.149, "Sph", 700, .0674)) Error in model.frame(formula, rownames, variables, varnames, extras, extranames, : variable lengths differ I'm not sure where the problem is as the lengths of
the variables are the same:
> length(meuse.grid$part.a)
[1] 3103 > length(meuse.grid$part.b) [1] 3103 > length(meuse.grid$dist) [1] 3103 Any ideas about what might be going wrong?
Cheers,
femke
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