R: Default function to create fixed matrix part of spatial...
Krig.null.function
R Documentation
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
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 (m-1).
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.