Krig.null.function {fields}R Documentation

Default function to create fixed matrix part of spatial process model.


Constructs a matrix of terms representing a low order polynomial and binds additional columns due to covariates ( the Z matrix)


Krig.null.function(x, Z = NULL, drop.Z = FALSE, m)


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).


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.


A matrix where the first columns are the polynomial terms and the following columns are from Z.


Doug Nychka

See Also


[Package fields version 3.3.1 Index]