Here, I want the canonical edge matrix e as in [p,e,t] in a 2D PDE problem, but it turned out to be an FEMeshAssociation object in a 3D problem.How can I extract the edge matrix from this object? The code is as follows.
W=2; D=2; H=2;
g = multicuboid(W,D,H);
model = createpde;
model.Geometry = g;
[p,e,t] = meshToPet(model.Mesh);