def test_meshfunction_where_equal():
mesh = UnitSquareMesh(MPI.comm_self, 2, 2)
cf = MeshFunction("size_t", mesh, mesh.topology.dim, 0)
cf.set_all(1)
cf[0] = 3
cf[3] = 3
assert list(cf.where_equal(3)) == [0, 3]
assert list(cf.where_equal(1)) == [1, 2, 4, 5, 6, 7]
ff = MeshFunction("size_t", mesh, mesh.topology.dim - 1, 100)
ff.set_all(0)
ff[0] = 1
ff[2] = 3
ff[3] = 3
assert list(ff.where_equal(1)) == [0]
assert list(ff.where_equal(3)) == [2, 3]
assert list(ff.where_equal(0)) == [1] + list(range(4, ff.size()))
vf = MeshFunction("size_t", mesh, 0, 0)
vf.set_all(3)
vf[1] = 1
vf[2] = 1
assert list(vf.where_equal(1)) == [1, 2]
assert list(vf.where_equal(3)) == [0] + list(range(3, vf.size()))
def test_Create(cube):
"""Create MeshFunctions."""
v = MeshFunction("size_t", cube, 0, 0)
assert v.size() == cube.num_vertices()
v = MeshFunction("size_t", cube, 1, 0)
assert v.size() == cube.num_entities(1)
v = MeshFunction("size_t", cube, 2, 0)
assert v.size() == cube.num_facets()
v = MeshFunction("size_t", cube, 3, 0)
assert v.size() == cube.num_cells()
def test_mesh_function_assign_2D_cells():
mesh = UnitSquareMesh(MPI.comm_world, 3, 3)
ncells = mesh.num_cells()
f = MeshFunction("int", mesh, mesh.topology.dim, 0)
for cell in Cells(mesh):
f[cell] = ncells - cell.index()
g = MeshValueCollection("int", mesh, 2)
g.assign(f)
assert ncells == f.size()
assert ncells == g.size()
f2 = MeshFunction("int", mesh, g, 0)
for cell in Cells(mesh):
value = ncells - cell.index()
assert value == g.get_value(cell.index(), 0)
assert f2[cell] == g.get_value(cell.index(), 0)
h = MeshValueCollection("int", mesh, 2)
global_indices = mesh.topology.global_indices(2)
ncells_global = mesh.num_entities_global(2)
for cell in Cells(mesh):
if global_indices[cell.index()] in [5, 8, 10]:
continue
value = ncells_global - global_indices[cell.index()]
h.set_value(cell.index(), int(value))
f3 = MeshFunction("int", mesh, h, 0)
values = f3.array()
values[values > ncells_global] = 0.
assert MPI.sum(mesh.mpi_comm(), values.sum() * 1.0) == 140.
def test_CreateAssign(cube):
"""Create MeshFunctions with value."""
i = 10
v = MeshFunction("size_t", cube, 0, i)
assert v.size() == cube.num_vertices()
assert v[0] == i
v = MeshFunction("size_t", cube, 1, i)
assert v.size() == cube.num_entities(1)
assert v[0] == i
v = MeshFunction("size_t", cube, 2, i)
assert v.size() == cube.num_facets()
assert v[0] == i
v = MeshFunction("size_t", cube, 3, i)
assert v.size() == cube.num_cells()
assert v[0] == i
def test_mesh_function_assign_2D_vertices():
mesh = UnitSquareMesh(MPI.comm_world, 3, 3)
mesh.create_entities(0)
f = MeshFunction("int", mesh, 0, 25)
g = MeshValueCollection("int", mesh, 0)
g.assign(f)
assert mesh.num_entities(0) == f.size()
assert mesh.num_cells() * 3 == g.size()
f2 = MeshFunction("int", mesh, g, 0)
for cell in Cells(mesh):
for i, vert in enumerate(VertexRange(cell)):
assert 25 == g.get_value(cell.index(), i)
assert f2[vert] == g.get_value(cell.index(), i)
def test_mesh_function_assign_2D_facets():
mesh = UnitSquareMesh(MPI.comm_world, 3, 3)
mesh.init(1)
f = MeshFunction("int", mesh, mesh.topology.dim - 1, 25)
for cell in Cells(mesh):
for i, facet in enumerate(FacetRange(cell)):
assert 25 == f[facet]
g = MeshValueCollection("int", mesh, 1)
g.assign(f)
assert mesh.num_facets() == f.size()
assert mesh.num_cells() * 3 == g.size()
for cell in Cells(mesh):
for i, facet in enumerate(FacetRange(cell)):
assert 25 == g.get_value(cell.index(), i)
f2 = MeshFunction("int", mesh, g, 0)
for cell in Cells(mesh):
for i, facet in enumerate(FacetRange(cell)):
assert f2[facet] == g.get_value(cell.index(), i)