Krig.null.function {fields} | 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.
Author(s)
Doug Nychka
See Also
Krig
[Package fields version 16.2 Index]