Creation of orientation matrix A of a face or edge for HGRAD elements. More...

Detailed Description

Creation of orientation matrix A of a face or edge for HGRAD elements.

$\sum_k A_ik \psi_k(\eta_o (\xi_j)) det(J_\eta) = \phi_i (\xi_j)$ where
$\psi_k$ are the basis functions of the reference cell ,
$\phi_i$ are the basis function of the subcell
$\eta_o$ is the orientation map o associated to the subcell s (o == subcellOrt)
$J_{\eta}$ is the Jacobian of the map $\eta_o$ ,
$\xi_j$ are points in the reference subcell such that subcell bases are uniquely determined by the values they take on these points.