poisson3d_1.form

利用C

# Copyright (C) 2005-2006 Anders Logg.
# Licensed under the GNU LGPL Version 2.1.
#
# First added:  2005
# Last changed: 2006-03-28
#
# Poisson's equation in 3D for q = 1

element = FiniteElement("Lagrange", "tetrahedron", 1)

v = TestFunction(element)
U = TrialFunction(element)
f = Function(element)

a = v.dx(i)*U.dx(i)*dx
L = v*f*dx