85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
// Copyright (C) 2017-2022 Yixuan Qiu <yixuan.qiu@cos.name>
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla
|
|
// Public License v. 2.0. If a copy of the MPL was not distributed
|
|
// with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
|
|
|
|
#ifndef SPECTRA_SYM_GEIGS_REG_INV_OP_H
|
|
#define SPECTRA_SYM_GEIGS_REG_INV_OP_H
|
|
|
|
#include <Eigen/Core>
|
|
|
|
#include "../SparseSymMatProd.h"
|
|
#include "../SparseRegularInverse.h"
|
|
|
|
namespace Spectra {
|
|
|
|
///
|
|
/// \ingroup Operators
|
|
///
|
|
/// This class defines the matrix operation for generalized eigen solver in the
|
|
/// regular inverse mode. This class is intended for internal use.
|
|
///
|
|
template <typename OpType = SparseSymMatProd<double>,
|
|
typename BOpType = SparseRegularInverse<double>>
|
|
class SymGEigsRegInvOp
|
|
{
|
|
public:
|
|
using Scalar = typename OpType::Scalar;
|
|
|
|
private:
|
|
using Index = Eigen::Index;
|
|
using Vector = Eigen::Matrix<Scalar, Eigen::Dynamic, 1>;
|
|
|
|
const OpType& m_op;
|
|
const BOpType& m_Bop;
|
|
mutable Vector m_cache; // temporary working space
|
|
|
|
public:
|
|
///
|
|
/// Constructor to create the matrix operation object.
|
|
///
|
|
/// \param op The \f$A\f$ matrix operation object.
|
|
/// \param Bop The \f$B\f$ matrix operation object.
|
|
///
|
|
SymGEigsRegInvOp(const OpType& op, const BOpType& Bop) :
|
|
m_op(op), m_Bop(Bop), m_cache(op.rows())
|
|
{}
|
|
|
|
///
|
|
/// Move constructor.
|
|
///
|
|
SymGEigsRegInvOp(SymGEigsRegInvOp&& other) :
|
|
m_op(other.m_op), m_Bop(other.m_Bop)
|
|
{
|
|
// We emulate the move constructor for Vector using Vector::swap()
|
|
m_cache.swap(other.m_cache);
|
|
}
|
|
|
|
///
|
|
/// Return the number of rows of the underlying matrix.
|
|
///
|
|
Index rows() const { return m_Bop.rows(); }
|
|
///
|
|
/// Return the number of columns of the underlying matrix.
|
|
///
|
|
Index cols() const { return m_Bop.rows(); }
|
|
|
|
///
|
|
/// Perform the matrix operation \f$y=B^{-1}Ax\f$.
|
|
///
|
|
/// \param x_in Pointer to the \f$x\f$ vector.
|
|
/// \param y_out Pointer to the \f$y\f$ vector.
|
|
///
|
|
// y_out = inv(B) * A * x_in
|
|
void perform_op(const Scalar* x_in, Scalar* y_out) const
|
|
{
|
|
m_op.perform_op(x_in, m_cache.data());
|
|
m_Bop.solve(m_cache.data(), y_out);
|
|
}
|
|
};
|
|
|
|
} // namespace Spectra
|
|
|
|
#endif // SPECTRA_SYM_GEIGS_REG_INV_OP_H
|