/usr/include/dolfin/fem/DiscreteOperators.h is in libdolfin-dev 2017.2.0.post0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | // Copyright (C) 2015 Garth N. Wells
//
// This file is part of DOLFIN.
//
// DOLFIN is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// DOLFIN is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with DOLFIN. If not, see <http://www.gnu.org/licenses/>.
#ifndef __DOLFIN_DISCRETE_OPERATORS_H
#define __DOLFIN_DISCRETE_OPERATORS_H
#include <memory>
namespace dolfin
{
class FunctionSpace;
class GenericMatrix;
/// Discrete gradient operators providing derivatives of functions
/// This class computes discrete gradient operators (matrices) that
/// map derivatives of finite element functions into other finite
/// element spaces. An example of where discrete gradient operators
/// are required is the creation of algebraic multigrid solvers for
/// H(curl) and H(div) problems.
/// NOTE: This class is highly experimental and likely to change. It
/// will eventually be expanded to provide the discrete curl and
/// divergence.
class DiscreteOperators
{
public:
/// Build the discrete gradient operator A that takes a \f$w \in H^1\f$
/// (P1, nodal Lagrange) to \f$v \in H(curl)\f$ (lowest order Nedelec),
/// i.e. v = Aw. V0 is the H(curl) space, and V1 is the P1
/// Lagrange space.
///
/// @param[in] V0 (FunctionSpace&)
/// H(curl) space
/// @param[in] V1 (FunctionSpace&)
/// P1 Lagrange space
///
/// @return GenericMatrix
static std::shared_ptr<GenericMatrix>
build_gradient(const FunctionSpace& V0, const FunctionSpace& V1);
};
}
#endif
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