SimSurvey (version 0.1.6)

.Q: Helper function to generate precision matrix Q for simulation

Description

This creates the precision matrix from a mesh created by R-INLA with a specified range. This is currently set up to support the standard spde approach of precision matrices and the barrier model version. Similar in purpose to .sp_covar.

Usage

.Q(
  mesh,
  barrier.triangles,
  range = 50,
  range_fraction = 0.2,
  sigma_u = 1,
  model = "spde"
)

Value

Q a sparse precision matrix of type dgTMatrix

Arguments

mesh

The mesh created by R-INLA representing spatial area

barrier.triangles

the list of triangles of the mesh in the barrier, only used for barrier model

range

decorrelation range

range_fraction

the fraction that sets the range over the "land" parts of the barrier model. Only used with the barrier model

sigma_u

the overall variance of the spatial process

model

'spde' for the SPDE approach, 'barrier' for barrier approach