inla.mesh.fem {INLA} | R Documentation

## Finite element matrices

### Description

Constructs finite element matrices for `inla.mesh` and `inla.mesh.1d` objects.

### Usage

    ## 2D and 1D meshes
    inla.mesh.fem(mesh, order = 2)

    ## 1D meshes, order 2 models only
    inla.mesh.1d.fem(mesh)

### Arguments

`mesh` | An `inla.mesh` or `inla.mesh.1d` object.
`order` | The model order.

### Value

A list of sparse matrices based on basis functions `psi_i`:

`c0` | `c0[i,j] = < psi_i, 1 >`
`c1` | `c1[i,j] = < psi_i, psi_j >`
`g1` | `g1[i,j] = < grad psi_i, grad psi_j >`
`g2` | `g2 = g1 * c0^-1 * g1`
`gk` | `gk = g1 * (c0^-1 * g1)^(k-1)`, up to and including `k=order`

### Author(s)

Finn Lindgren finn.lindgren@gmail.com

[Package INLA version 18.07.12 Index]