gsBiCgStab.h

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#pragma once
 
#include <gsSolver/gsIterativeSolver.h>
 
namespace gismo
{
 
template<class T = real_t>
class gsBiCgStab : public gsIterativeSolver<T>
{
public:
    typedef gsIterativeSolver<T> Base;
 
    typedef gsMatrix<T>  VectorType;
 
    typedef typename Base::LinOpPtr LinOpPtr;
 
    typedef memory::shared_ptr<gsBiCgStab> Ptr;
    typedef memory::unique_ptr<gsBiCgStab> uPtr;
 
    template< typename OperatorType >
    explicit gsBiCgStab( const OperatorType& mat, const LinOpPtr& precond = LinOpPtr() )
    : Base(mat, precond), m_restartThereshold(1e-32) {}
 
    template< typename OperatorType >
    static uPtr make( const OperatorType& mat, const LinOpPtr& precond = LinOpPtr() )
    { return uPtr( new gsBiCgStab(mat, precond) ); }
 
    static gsOptionList defaultOptions()
    {
        gsOptionList opt = Base::defaultOptions();
        opt.addReal("RestartThereshold", "Thereshold for restarting gsBiCgStab solver.", 1e-32 );
        return opt;
    }
 
    gsBiCgStab& setOptions(const gsOptionList& opt)
    {
        Base::setOptions(opt);
        m_restartThereshold = opt.askReal("RestartThereshold", m_restartThereshold);
        return *this;
    }
 
    bool initIteration( const VectorType& rhs, VectorType& x );
    bool step( VectorType& x );
 
    std::ostream &print(std::ostream &os) const
    {
        os << "gsBiCgStab\n";
        return os;
    }
 
private:
    using Base::m_mat;
    using Base::m_precond;
    using Base::m_max_iters;
    using Base::m_tol;
    using Base::m_num_iter;
    using Base::m_rhs_norm;
    using Base::m_error;
 
    VectorType m_res;
    VectorType m_r0;
    VectorType m_tmp;
    VectorType m_v;
    VectorType m_p;
    VectorType m_y;
    VectorType m_s;
    VectorType m_z;
    VectorType m_t;
 
    T m_alpha;
    T m_rho;
    T m_w;
 
    T m_restartThereshold;
};
 
} // namespace gismo
 
#ifndef GISMO_BUILD_LIB
#include GISMO_HPP_HEADER(gsBiCgStab.hpp)
#endif