energynorm.form

利用C

# Copyright (C) 2005-2006 Anders Logg ([e-mail])
# Licensed under the GNU LGPL Version 2.1
#
# This example demonstrates how to define a functional, here
# the energy norm (squared) for a reaction-diffusion problem.
#
# Compile this form with FFC: ffc -l dolfin EnergyNorm.form

element = FiniteElement("Lagrange", "triangle", 2)

v = Function(element)
M = (v*v + dot(grad(v), grad(v)))*dx