Precision matrices for SPDE models

Calculates the precision matrix for given parameter values based on an inla.spde model object.

<!-- %% Standard usage for inla.spde2.models: -->
<!-- %% inla.spde.precision(spde, theta = c(...)) -->

inla.spde.precision(...)

# S3 method for class 'inla.spde2'
inla.spde.precision(spde,
                    theta = NULL,
                    phi0 = inla.spde2.theta2phi0(spde, theta),
                    phi1 = inla.spde2.theta2phi1(spde, theta),
                    phi2 = inla.spde2.theta2phi2(spde, theta), ...)
inla.spde2.precision(spde,
                     theta = NULL,
                     phi0 = inla.spde2.theta2phi0(spde, theta),
                     phi1 = inla.spde2.theta2phi1(spde, theta),
                     phi2 = inla.spde2.theta2phi2(spde, theta), ...)

## For deprecated inla.spde1 models:
# S3 method for class 'inla.spde1'
inla.spde.precision(spde, ...)
inla.spde1.precision(spde, ...)

Arguments

spde

An inla.spde object.

theta

The parameter vector.

phi0

Internal parameter for a generic model. Expert option only.

phi1

Internal parameter for a generic model. Expert option only.

phi2

Internal parameter for a generic model. Expert option only.

...

Additional parameters passed on to other methods.

Value

A sparse precision matrix.

Author

Finn Lindgren finn.lindgren@gmail.com