fix

Author: pbrubeck

demos/netgen/netgen_mesh.py.rst

@@ -346,7 +346,7 @@ We can set the degree of the geometry via ``netgen_flags`` keyword argument of t
        ngmesh = OCCGeometry(shape, dim=2).GenerateMesh(maxh=1.)
    else:
        ngmesh = netgen.libngpy._meshing.Mesh(2)
-   mesh = Mesh(ngmesh, comm=COMM_WORLD, netgen_flags={"degree": 3})
+   mesh = Mesh(ngmesh, comm=COMM_WORLD, netgen_flags={"degree": 4})
    VTKFile("output/MeshExample5.pvd").write(mesh)
 
 .. figure:: Example5.png
@@ -365,7 +365,7 @@ We will now show how to solve the Poisson problem on a high-order mesh, of order
        ngmesh = OCCGeometry(shape, dim=3).GenerateMesh(maxh=1.)
    else:
        ngmesh = netgen.libngpy._meshing.Mesh(3)
-   mesh = Mesh(ngmesh, netgen_flags={"degree": 4})
+   mesh = Mesh(ngmesh, netgen_flags={"degree": 3})
 
    # Solving the Poisson problem
    VTKFile("output/MeshExample6.pvd").write(mesh)

firedrake/netgen.py

@@ -38,7 +38,7 @@ def netgen_distribute(V: firedrake.functionspaceimpl.WithGeometryBase,
     Parameters
     ----------
     V
-        The target function space defining the data DMPlex layout.
+        The target function space defining the DMPlex layout.
     netgen_data
         The data in the layout of the underlying netgen mesh.
 
@@ -97,9 +97,6 @@ def find_permutation(points_a: npt.NDArray[np.inexact], points_b: npt.NDArray[np
         raise ValueError("`points_a` and `points_b` must have the same shape.")
 
     p = [np.where(cdist(a, b).T < tol)[1] for a, b in zip(points_a, points_b)]
-    if len(p) == 0:
-        return p
-
     try:
         permutation = np.array(p, ndmin=2)
     except ValueError as e:
@@ -145,7 +142,7 @@ class FiredrakeMesh:
     :param netgen_flags: The dictionary of flags to be passed to ngsPETSc.
     :arg comm: the MPI communicator.
     '''
-    def __init__(self, mesh, netgen_flags=None, user_comm=COMM_WORLD):
+    def __init__(self, mesh, netgen_flags, user_comm=COMM_WORLD):
         self.comm = user_comm
         # Parsing netgen flags
         if not isinstance(netgen_flags, dict):