inla.mesh.lattice {INLA} | R Documentation

## Lattice grids for inla.mesh

### Description

since `⁠23.08.18⁠`. Use `fmesher::fm_lattice_2d()` instead.

Construct a lattice grid for `inla.mesh()`

### Usage

    inla.mesh.lattice(
      x = seq(0, 1, length.out = 2),
      y = seq(0, 1, length.out = 2),
      z = NULL,
      dims = if (is.matrix(x)) {
         dim(x)
     } else {
         c(length(x), length(y))
     },
      units = NULL,
      crs = NULL
    )

### Arguments

`x` | vector or grid matrix of x-values
`y` | vector of grid matrix of y-values
`z` | if x is a matrix, a grid matrix of z-values
`dims` | the size of the grid, length 2 vector
`units` | One of `c("default", "longlat", "longsinlat")`.
`crs` | An optional `CRS` or `inla.CRS` object

### Value

An `inla.mesh.lattice` object.

### Author(s)

Finn Lindgren finn.lindgren@gmail.com

### See Also

`inla.mesh()`

### Examples

    lattice <- inla.mesh.lattice(seq(0, 1, length.out = 17), seq(0, 1, length.out = 10))

    ## Use the lattice "as-is", without refinement:
    mesh <- inla.mesh.create(lattice = lattice, boundary = lattice$segm)
    mesh <- inla.mesh.create(lattice = lattice, extend = FALSE)
    plot(mesh)

    ## Refine the triangulation, with limits on triangle angles and edges:
    mesh <- inla.mesh.create(
      lattice = lattice,
      refine = list(max.edge = 0.08),
      extend = FALSE
    )
    plot(mesh)

    ## Add an extension around the lattice, but maintain the lattice edges:
    mesh <- inla.mesh.create(
      lattice = lattice,
      refine = list(max.edge = 0.08),
      interior = lattice$segm
    )
    plot(mesh)

    ## Only add extension:
    mesh <- inla.mesh.create(lattice = lattice, refine = list(max.edge = 0.08))
    plot(mesh)

[Package INLA version 26.02.05 Index]