I wrote the following code. I am wondering how do I save the solutions in .txt format? Can anyone please help me ? from __future__ import print_function from fenics import * from dolfin import * import matplotlib.pyplot as plt import numpy as np # Create mesh and define the function space mesh = R…

What do you imply by saving the solution in txt format? As txt format is simply a file with text in it, you can use python’s built in functions to write the data as you wnant to order it. See for instance https://docs.python.org/3.6/tutorial/inputoutput.html#reading-and-writing-files

Basically, I want to save the text file which contain the coordinate of the mesh and the solution corresponding to that coordinate.

What is V.num_sub_space? num_dofs_per_component = int(V.dim()/V.num_sub_spaces()) ZeroDivisionError: division by zero

If you are using a scalar space, simply look at: [image] 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_co…

I already printed the dof_coordinates and u.vector().get_local(). I want to save them in the .txt file format. Like first coordinate and then solution corresponding to that coordinate.

from dolfin import * mesh = UnitSquareMesh(2, 2) V = FunctionSpace(mesh, "CG", 1) u = project(Expression("x[0]*x[1]", degree=1), V) coords = V.tabulate_dof_coordinates() vec = u.vector().get_local() outfile = open("output.txt", "w") for coord, val in zip(coords, vec): print(coord[0], coord[1], v…

Thank you, it’s working. I also want to calculate L2 error by using error norm function. In this code, I have different boundaries, so how can I calculate the L2 error by using error_L2 = errornorm(u_D, u, 'L2'). ?

What do you mean by different boundaries? Please supply a minimal code example as described in Read before posting: How do I get my question answered?

How to save solution in .txt format?

I/O

dokken May 13, 2021, 5:14pm 4

See for instance: How to get the solution obatained by fenics as a vector? - #7 by dokken

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How to save solution in .txt format?

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