discretize.TensorMesh.project_edge_to_boundary_edge#

property TensorMesh.project_edge_to_boundary_edge#

Projection matrix from all edges to boundary edges.

Constructs and returns a matrix $\mathbf{P}$ that projects from all mesh edges to boundary edges. That is, for a discrete vector $\mathbf{u}$ that lives on the edges, the values on the boundary edges ${\mathbf{u}}_{\mathbf{b}}$ can be extracted via the following matrix-vector product:

ub = P @ u

Returns:

(n_boundary_edges, n_edges) scipy.sparse.csr_matrix

Projection matrix with shape