I am working with an .xdmf model using dolfinx and trying to assemble the stiffness and mass matrix associated to the Laplace equation to solve and eigenvalue problem.
When I run the code, I get the following warning:
Level 25:UFL:Expr.ufl_domain() is deprecated, please use extract_unique_domain(expr) instead.
How should I modify my code to avoid this? I ran the same code a couple months ago and didn’t have this problem.
The lines of code I’m runing are the following:
with XDMFFile(MPI.COMM_WORLD, "mesh.xdmf", "r") as xdmf: domain = xdmf.read_mesh(name="Grid") #FEM function space V = fem.FunctionSpace(domain, ("Lagrange", 1)) #Trial and Test functions u = ufl.TrialFunction(V) v = ufl.TestFunction(V) #Stifness matrix a = ufl.dot(ufl.grad(u),ufl.grad(v))*ufl.dx #Mass matrix b = u*v*ufl.dx #Assemble A = fem.petsc.assemble_matrix(fem.form(a)) B = fem.petsc.assemble_matrix(fem.form(b)) A.assemble() B.assemble()
Thanks for any help.