poisson.form

利用C

# Copyright (C) 2008 Anders Logg.
# Licensed under the GNU LGPL Version 2.1.
#
# First added:  2008-05-23
# Last changed: 2007-05-23
#
# The bilinear form a(v, U) and linear form L(v) for
# Poisson's equation.
#
# Compile this form with FFC: ffc -l dolfin Poisson.form.

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

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

a = dot(grad(v), grad(u))*dx
L = v*f*dx