How to save solution in .txt format?

[dokken]

If you are using a scalar space, simply look at:

How to get the solution obtained by fenics as a vector?

Consider the following minimal example: from dolfin import * mesh = UnitSquareMesh(2, 2) V = FunctionSpace(mesh, "CG", 2) dof_coordinates = V.tabulate_dof_coordinates() expr = Expression("x[0]", degree=1) uh = Function(V) uh.interpolate(expr) print(dof_coordinates) print(uh.vector().get_local())

the $i$th entry in dof_coordinates corresponds to the coordinate of the $i$th degree of freedom, which is the $i$th entry of u.vector().get_local()