Directional derivative matrices for functions on meshes.
inla.mesh.deriv.Rd![[Deprecated]](figures/lifecycle-deprecated.svg)
since 23.08.18.
Use fmesher::fm_basis() instead.
Calculates directional derivative matrices for functions on
inla.mesh() objects.
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.