OEMSolver.h 7.68 KB
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// ============================================================================
// ==                                                                        ==
// == AMDiS - Adaptive multidimensional simulations                          ==
// ==                                                                        ==
// ============================================================================
// ==                                                                        ==
// ==  crystal growth group                                                  ==
// ==                                                                        ==
// ==  Stiftung caesar                                                       ==
// ==  Ludwig-Erhard-Allee 2                                                 ==
// ==  53175 Bonn                                                            ==
// ==  germany                                                               ==
// ==                                                                        ==
// ============================================================================
// ==                                                                        ==
// ==  http://www.caesar.de/cg/AMDiS                                         ==
// ==                                                                        ==
// ============================================================================

/** \file OEMSolver.h */

/**
 * \defgroup Solver Solver module
 * @{ <img src="solver.png"> @}
 * 
 * \brief
 * Contains all classes needed for solving linear and non linear equation
 * systems.
 */

#ifndef AMDIS_OEM_SOLVER_H
#define AMDIS_OEM_SOLVER_H

#include "Global.h"
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#include "AMDiS_fwd.h"
#include "Parameters.h"
#include "SolverMatrix.h"
#include "DOFVector.h"
#include "SystemVector.h"
#include "DOFMatrix.h"
#include "ITL_Preconditioner.h"
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namespace AMDiS {

  /**
   * \ingroup Solver
   * 
   *\brief
   * Solver for linear equation systems.
   */
  class OEMSolver
  {
  public:
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    typedef DOFMatrix::base_matrix_type   matrix_type;
    typedef DOFMatrix::value_type         value_type;

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    /// The constructor reads needed parameters and sets solvers \ref name.
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    OEMSolver(std::string str) 
      : name(str),
	tolerance(0),
	relative(0),
	max_iter(1000),
	info(0),
	residual(0),
	print_cycle(100),
	leftPrecon(NULL),
	rightPrecon(NULL)
    {}
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    /** \brief
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     *      
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     */
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    virtual ~OEMSolver() 
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    {
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      if (leftPrecon) delete leftPrecon;
      if (rightPrecon) delete rightPrecon;
    }
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    void initParameters()
    {
      FUNCNAME("OEMSolver::initParameters()");
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      GET_PARAMETER(0, name + "->tolerance", "%f", &tolerance);
      GET_PARAMETER(0, name + "->relative tolerance", "%f", &relative);
      GET_PARAMETER(0, name + "->max iteration", "%d", &max_iter);
      GET_PARAMETER(0, name + "->print cycle", "%d", &print_cycle);
      GET_PARAMETER(0, name + "->info", "%d", &info);
    }
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    /** Set left Preconditioner
     *
     *  It is assumed that the solver owns the preconditioner from this call.
     *  That means that the preconditioner is deleted by the solver when not needed.
     */
    void setLeftPrecon(ITL_BasePreconditioner* p) 
    {
	if (leftPrecon) delete leftPrecon;
	leftPrecon= p;
    }
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    /** Set right Preconditioner
     *
     *  It is assumed that the solver owns the preconditioner from this call.
     *  That means that the preconditioner is deleted by the solver when not needed.
     */
    void setRightPrecon(ITL_BasePreconditioner* p) 
    {
	if (rightPrecon) delete rightPrecon;
	rightPrecon= p;
    }
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    /// Linear System to be solved in the derived class
    virtual int solveSystem(const DOFMatrix::base_matrix_type&      A,
			    mtl::dense_vector<value_type>&          x,
			    const mtl::dense_vector<value_type>&    b) = 0;
    
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    /// Solve a linear system for a scalar problem.
    int solveSystem(const SolverMatrix<DOFMatrix>& A,
		    DOFVector<double>&             x, 
		    DOFVector<double>&             b) 
    {
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      mtl::dense_vector<value_type>   xx(x.getUsedSize()),
	                              bb(b.getUsedSize());

      // Copy rhs vector
      int counter = 0;
      DOFVector<double>::Iterator it_b(&b, USED_DOFS);
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      DOFVector<double>::Iterator it_x(&x, USED_DOFS);
      for (it_b.reset(), it_x.reset(); !it_b.end(); ++it_b, ++it_x) {	
	bb[counter] = *it_b;
	xx[counter] = *it_x;
	counter++;
      }
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      int r = solveSystem(A.getMatrix(), xx, bb);

      // Copy solution vector to DOFVector
      counter = 0;
      for (it_x.reset(); !it_x.end(); ++it_x)
	*it_x = xx[counter++];

      return r;
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    }
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    /// Solve a linear system for a vectorial problem.
    int solveSystem(const SolverMatrix<Matrix<DOFMatrix*> >& A,
		    SystemVector&                            x, 
		    SystemVector&                            b) 
    {
      int ns=  x.getSize(),  // Number of systems.
          size= x.getUsedSize(); // Size of all DOFVectors

      // Copy vectors
      mtl::dense_vector<value_type>   xx(size), bb(size);
      for (int i = 0, counter = 0; i < ns; i++) {
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	  DOFVector<double>::Iterator it_b(b.getDOFVector(i), USED_DOFS);	  
	  DOFVector<double>::Iterator it_x(x.getDOFVector(i), USED_DOFS);

	  for (it_b.reset(), it_x.reset(); !it_b.end(); ++it_b, ++it_x) {	
	      bb[counter] = *it_b;
	      xx[counter] = *it_x;
	      counter++;
	  }
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      }

      // Solver on DOFVector for single system
      int r= solveSystem(A.getMatrix(), xx, bb);

      for (int i = 0, counter = 0; i < ns; i++) {
	  DOFVector<double>::Iterator it(x.getDOFVector(i), USED_DOFS);	  
	  for (it.reset(); !it.end(); ++it)	
	      *it = xx[counter++];	
      }
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      return r;
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    }
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    /** \name getting methods
     * \{ 
     */

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    /// Returns solvers \ref name.
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    inline const std::string& getName() { 
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      return name; 
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    }
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    /// Returns \ref tolerance
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    inline double getTolerance() {
      return tolerance;
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    }  
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    /// Returns \ref max_iter
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    inline int getMaxIterations() {
      return max_iter;
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    }
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    /// Returns \ref residual
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    inline double getResidual() {
      return residual;
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    }
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    /** \} */ 

    /** \name setting methods
     * \{ 
     */

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    /// Sets \ref tolerance
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    inline void setTolerance(double tol) {
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      tolerance = tol;
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    }
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    /// Sets \ref relative
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    inline void setRelative(bool rel) {
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      relative = rel;
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    }
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    /// Sets \ref max_iter
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    inline void setMaxIterations(int i) {
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      max_iter = i;
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    }
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    /// Sets \ref info
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    inline void setInfo(int i) {
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      info = i;
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    }
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    /** \} */

  protected:
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    /// solvers name.
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    std::string name;
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    /// Solver tolerance |r|. Set in OEMSolver's constructor. 
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    double tolerance;

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    /// Relative solver tolerance |r|/|r0|. Set in OEMSolver's constructor. 
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    double relative;
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    /// maximal number of iterations. Set in OEMSolver's constructor.
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    int max_iter;

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    /// info level during solving the system. Set in OEMSolver's constructor.
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    int info;

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    /// current residual.
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    double residual;

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    /// Print cycle, after how many iterations the residuum norm is logged.
    int print_cycle;
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    ITL_BasePreconditioner *leftPrecon;
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    ITL_BasePreconditioner *rightPrecon;
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  };

  /** 
   * \ingroup Solver
   *
   * \brief
   * Interface for creators of concrete OEMSolvers. 
   */
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  class OEMSolverCreator : public CreatorInterface<OEMSolver>
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  { 
  public:
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    virtual ~OEMSolverCreator() {}
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    /// Sets \ref problem
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    void setName(std::string str) { 
      name = str; 
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    }
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  protected:
    /** \brief
     * Pointer to the problem the solver will belong to. Needed as parameter
     * when constructing an OEMSolver
     */
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    std::string name;
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  };
}

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#include "ITL_Solver.h"
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#endif // AMDIS_OEM_SOLVER_H