Illustrative code to build the precision matrix for SPDE kind models.

Creates a precision matrix as a sparse matrix object. For general code look at the functions in the INLA package.

Usage

spde2precision(kappa, fem, alpha)

Arguments

kappa

the scale parameter.

fem

a list containing the Finite Element matrices.

alpha

the smoothness parameter.

Value

the precision matrix as a sparse matrix object.

Warning

This is just for illustration purpose and one should consider the efficient function available a the INLA package.