inla.mesh.deriv {INLA} | R Documentation

## Directional derivative matrices for functions on meshes.

### Description

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 18.07.12 Index]