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/*
* Copyright 2008-2009 NVIDIA Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*! \file jacobi.h
* \brief Jacobi relaxation.
*/
#pragma once
#include <cusp/detail/config.h>
#include <cusp/linear_operator.h>
namespace cusp
{
namespace precond
{
namespace aggregation
{
// forward definitions
template<typename MatrixType> struct sa_level;
} // end namespace aggregation
} // end namespace precond
namespace relaxation
{
template <typename ValueType, typename MemorySpace>
class jacobi : public cusp::linear_operator<ValueType, MemorySpace>
{
public:
ValueType default_omega;
cusp::array1d<ValueType,MemorySpace> diagonal;
cusp::array1d<ValueType,MemorySpace> temp;
jacobi();
template <typename MatrixType>
jacobi(const MatrixType& A, ValueType omega=1.0);
template <typename MemorySpace2>
jacobi(const jacobi<ValueType,MemorySpace2>& A);
template <typename MatrixType>
jacobi(const cusp::precond::aggregation::sa_level<MatrixType>& sa_level, ValueType weight=4.0/3.0);
// ignores initial x
template<typename MatrixType, typename VectorType1, typename VectorType2>
void presmooth(const MatrixType& A, const VectorType1& b, VectorType2& x);
// smooths initial x
template<typename MatrixType, typename VectorType1, typename VectorType2>
void postsmooth(const MatrixType& A, const VectorType1& b, VectorType2& x);
template <typename MatrixType, typename VectorType1, typename VectorType2>
void operator()(const MatrixType& A, const VectorType1& b, VectorType2& x);
template <typename MatrixType, typename VectorType1, typename VectorType2>
void operator()(const MatrixType& A, const VectorType1& b, VectorType2& x, ValueType omega);
};
} // end namespace relaxation
} // end namespace cusp
#include <cusp/relaxation/detail/jacobi.inl>
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