/usr/include/deal.II/numerics/dof_print_solver_step.h is in libdeal.ii-dev 8.1.0-6ubuntu1.
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// $Id: dof_print_solver_step.h 30036 2013-07-18 16:55:32Z maier $
//
// Copyright (C) 2000 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__dof_print_solver_step_h
#define __deal2__dof_print_solver_step_h
#include <deal.II/base/config.h>
#include <deal.II/base/logstream.h>
#include <deal.II/lac/solver_control.h>
#include <deal.II/lac/vector_memory.h>
#include <deal.II/numerics/data_out.h>
#include <sstream>
#include <iomanip>
#include <fstream>
DEAL_II_NAMESPACE_OPEN
/**
* Print intermediate solutions in solvers. This is derived from a
* solver class provided as template argument. It implements the
* @p print_vector function of the solver using a
* DoFHandler. This way, the intermediate vectors can be viewed
* as finite element functions. This class might be used first to
* understand how solvers work (for example to visualize the smoothing
* properties of various solvers, e.g. in a multigrid context), and
* second to investigate why and how a solver fails to solve certain
* classes of problems.
*
* Objects of this class are provided with a solver class through a
* template argument, and with a file name (as a string), with which a
* new file is constructed in each iteration (named
* <tt>basename.[step].[suffix]</tt>) and into which the solution is
* written as a finite element field using the DataOut class.
* Please note that this class may produce enormous amounts of data!
*
* @ingroup output
* @author Guido Kanschat, 2000
*/
template<int dim, class SOLVER, class VECTOR = Vector<double> >
class DoFPrintSolverStep : public SOLVER
{
public:
/**
* Constructor. First, we take
* the arguments needed for the
* solver. @p data_out is the
* object doing the output as a
* finite element function.
*
* One output file with the name
* <tt>basename.[step].[suffix]</tt>
* will be produced for each
* iteration step.
*/
DoFPrintSolverStep (SolverControl &control,
VectorMemory<VECTOR> &mem,
DataOut<dim> &data_out,
const std::string &basename);
/**
* Call-back function for the
* iterative method.
*/
virtual void print_vectors (const unsigned int step,
const VECTOR &x,
const VECTOR &r,
const VECTOR &d) const;
private:
/**
* Output object.
*/
DataOut<dim> &out;
/**
* Base of filenames.
*/
const std::string basename;
};
/* ----------------------- template functions --------------- */
template<int dim, class SOLVER, class VECTOR>
DoFPrintSolverStep<dim, SOLVER, VECTOR>::DoFPrintSolverStep (SolverControl &control,
VectorMemory<VECTOR> &mem,
DataOut<dim> &data_out,
const std::string &basename)
: SOLVER (control, mem),
out (data_out),
basename (basename)
{}
template<int dim, class SOLVER, class VECTOR>
void
DoFPrintSolverStep<dim, SOLVER, VECTOR>::print_vectors (const unsigned int step,
const VECTOR &x,
const VECTOR &r,
const VECTOR &d) const
{
out.clear_data_vectors();
out.add_data_vector(x, "solution");
out.add_data_vector(r, "residual");
out.add_data_vector(d, "update");
std::ostringstream filename;
filename << basename
<< std::setw(3) << std::setfill('0') << step
<< out.default_suffix();
const std::string fname = filename.str();
deallog << "Writing file:" << fname << std::endl;
out.build_patches();
std::ofstream of (fname.c_str());
out.write (of);
}
DEAL_II_NAMESPACE_CLOSE
#endif
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