discretize.base.BaseRegularMesh.project_face_to_boundary_face#
- property BaseRegularMesh.project_face_to_boundary_face#
Projection matrix from all faces to boundary faces.
Constructs and returns a matrix \(\mathbf{P}\) that projects from all mesh faces to boundary faces. That is, for a discrete vector \(\mathbf{u}\) that lives on the faces, the values on the boundary faces \(\mathbf{u_b}\) can be extracted via the following matrix-vector product:
ub = P @ u
- Returns
scipy.sparse.csr_matrix
(n_boundary_faces, n_faces) Projection matrix with shape