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 Krig.null.function: Default function to create fixed matrix part of spatial...
Default function to create fixed matrix part of spatial process model.
Description
Constructs a matrix of terms representing a low order polynomial and binds additional columns due to covariates ( the Z matrix)
Usage
1  Krig.null.function(x, Z = NULL, drop.Z = FALSE, m)

Arguments
x 
Spatial locations 
Z 
Other covariates to be associated with each location. 
drop.Z 
If TRUE only the low order polynomial part is created. 
m 
The polynomial order is (m1). 
Details
This function can be modified to produce a different fixed part of the spatial model. The arguments x, Z and drop.Z are required but other arguments can be passed as part of a list in null.args in the call to Krig.
Value
A matrix where the first columns are the polynomial terms and the following columns are from Z.
Author(s)
Doug Nychka
See Also
Krig
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