ainv.h

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/*
 *  Copyright 2008-2010 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.
 */

#pragma once

#include <cusp/detail/config.h>

#include <cusp/linear_operator.h>
#include <cusp/hyb_matrix.h>

namespace cusp
{
namespace precond
{


template <typename ValueType, typename MemorySpace>
class scaled_bridson_ainv : public linear_operator<ValueType, MemorySpace>
{
private:
    typedef linear_operator<ValueType, MemorySpace> Parent;

public:
    cusp::hyb_matrix<int, ValueType, MemorySpace> w;
    cusp::hyb_matrix<int, ValueType, MemorySpace> w_t;

    template<typename MatrixTypeA>
    scaled_bridson_ainv(const MatrixTypeA & A, ValueType drop_tolerance=0.1, int nonzero_per_row=-1, bool lin_dropping=false, int lin_param=1);

    template <typename VectorType1, typename VectorType2>
    void operator()(const VectorType1& x, VectorType2& y);

protected:

    cusp::array1d<ValueType, MemorySpace> temp1;
};

template <typename ValueType, typename MemorySpace>
class bridson_ainv : public linear_operator<ValueType, MemorySpace>
{
private:
    typedef linear_operator<ValueType, MemorySpace> Parent;

public:
    cusp::hyb_matrix<int, ValueType, MemorySpace> w;
    cusp::hyb_matrix<int, ValueType, MemorySpace> w_t;
    cusp::array1d<ValueType, MemorySpace> diagonals;

    template<typename MatrixTypeA>
    bridson_ainv(const MatrixTypeA & A, ValueType drop_tolerance=0.1, int nonzero_per_row =-1, bool lin_dropping=false, int lin_param=1);

    template <typename VectorType1, typename VectorType2>
    void operator()(const VectorType1& x, VectorType2& y);

protected:
    cusp::array1d<ValueType, MemorySpace> temp1;
    cusp::array1d<ValueType, MemorySpace> temp2;
};

template <typename ValueType, typename MemorySpace>
class nonsym_bridson_ainv : public linear_operator<ValueType, MemorySpace>
{
private:
    typedef linear_operator<ValueType, MemorySpace> Parent;

public:
    cusp::hyb_matrix<int, ValueType, MemorySpace> w_t;
    cusp::hyb_matrix<int, ValueType, MemorySpace> z;
    cusp::array1d<ValueType, MemorySpace> diagonals;

    template<typename MatrixTypeA>
    nonsym_bridson_ainv(const MatrixTypeA & A, ValueType drop_tolerance=0.1, int nonzero_per_row=-1, bool lin_dropping=false, int lin_param=1);

    template <typename VectorType1, typename VectorType2>
    void operator()(const VectorType1& x, VectorType2& y);

protected:
    cusp::array1d<ValueType, MemorySpace> temp1;
    cusp::array1d<ValueType, MemorySpace> temp2;
};
} // end namespace precond
} // end namespace cusp

#include <cusp/precond/detail/ainv.inl>