inla.mesh.deriv {INLA} | R Documentation

## Directional derivative matrices for functions on meshes.

### Description

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

Calculates directional derivative matrices for functions on `inla.mesh()` objects.

### Usage

    inla.mesh.deriv(mesh, loc)

### Arguments

`mesh` | An `inla.mesh()` object.
`loc` | Coordinates where the derivatives should be evaluated.

### Value

`A` | The projection matrix, `⁠u(loc_i)=sum_j A_ij w_i⁠`
`dx`, `dy`, `dz` | Derivative weight matrices, `⁠du/dx(loc_i)=sum_j dx_ij w_i⁠`, etc.

### Author(s)

Finn Lindgren finn.lindgren@gmail.com

[Package INLA version 26.02.05 Index]