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Tue, May 7, 11:05

solver_eigen.cc
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/**
* file solver_eigen.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 15 May 2018
*
* @brief Implementations for bindings to Eigen's iterative solvers
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "solver/solver_eigen.hh"
#include <iomanip>
#include <sstream>
namespace muSpectre {
/* ---------------------------------------------------------------------- */
template <class SolverType>
SolverEigen<SolverType>::SolverEigen(Cell& cell, Real tol,
Uint maxiter, bool verbose):
Parent(cell, tol, maxiter, verbose),
adaptor{cell.get_adaptor()},
solver{},
result{}
{}
/* ---------------------------------------------------------------------- */
template <class SolverType>
void SolverEigen<SolverType>::initialise() {
this->solver.setTolerance(this->get_tol());
this->solver.setMaxIterations(this->get_maxiter());
this->solver.compute(this->adaptor);
}
/* ---------------------------------------------------------------------- */
template <class SolverType>
auto SolverEigen<SolverType>::solve(const ConstVector_ref rhs)
-> Vector_map {
// for crtp
auto & this_solver = static_cast<SolverType&> (*this);
this->result = this->solver.solve(rhs);
this->counter += this->solver.iterations();
if (this->solver.info() != Eigen::Success) {
std::stringstream err {};
err << this_solver.get_name() << " has not converged,"
<< " After " << this->solver.iterations() << " steps, the solver "
<< " FAILED with |r|/|b| = "
<< std::setw(15) << this->solver.error()
<< ", cg_tol = " << this->tol << std::endl;
throw ConvergenceError(err.str());
}
if (this->verbose) {
std::cout << " After " << this->solver.iterations() << " "
<< this_solver.get_name() << " steps, |r|/|b| = "
<< std::setw(15) << this->solver.error()
<< ", cg_tol = " << this->tol << std::endl;
}
return Vector_map(this->result.data(), this->result.size());
}
/* ---------------------------------------------------------------------- */
template class SolverEigen<SolverCGEigen>;
template class SolverEigen<SolverGMRESEigen>;
template class SolverEigen<SolverBiCGSTABEigen>;
template class SolverEigen<SolverDGMRESEigen>;
template class SolverEigen<SolverMINRESEigen>;
} // muSpectre

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