// elastic_genTerm - A linear solver for elastic problems using FEM
// Copyright (C) 2010-2026 Eric Bechet
//
// See the LICENSE file for license information and contributions.
// Please report all bugs and problems to <bechet@cadxfem.org>.

#include <cstring>
#include <cstdio>
#include <fstream>

#include "elasticSolver.h"
#include "genAlgorithms.h"
#include "genSField.h"
#include "linearSystemCSR.h"
#include "linearSystemPETSc.h"
#include "linearSystemId.h"

#if defined(HAVE_POST)
#include "PView.h"
#include "PViewData.h"
#endif


ElasticSolver::~ElasticSolver()
{
  if (pAssembler) delete pAssembler;
  for (int i=0; i<EDomains.size(); ++i) delete EDomains[i];
}

void ElasticSolver::CheckProperties()
{
  for (int i=0; i<Data->Domains.size(); ++i)
  {
    if (Data->Domains[i]->type=="Elastic")
    {
      ElasticDomain* field = new ElasticDomain(*(Data->Domains[i]));
      EDomains.push_back (field);
    }
    else if (Data->Domains[i]->type=="IsotropicElastic")
    {
      IsotropicElasticDomain* field = new IsotropicElasticDomain(*(Data->Domains[i]));
      EDomains.push_back (field);
    }
    else if (Data->Domains[i]->type=="OrthotropicElastic")
    {
      OrthotropicElasticDomain* field = new OrthotropicElasticDomain(*(Data->Domains[i]));
      EDomains.push_back (field);
    }
  }
}


void ElasticSolver::readInputFile ( const std::string &fileName )
{
  modelname = fileName;
  std::cout<<"model name : " << modelname << std::endl ;
  Data->readInputFile(fileName);
  CheckProperties();
  printf("--> %d Domains\n", (int)EDomains.size());
  printf("--> %d BCs \n", (int)Data->BCs.size());
}




void ElasticSolver::CreateFunctionSpaces()
{
  if ( Data->dim==3 )
    FSpaceDisp = genFSpace<genTensor1<double> >::Handle(new VectorLagrangeFSpace<double>());
//     FSpaceDisp = genFSpace<genTensor1<double> >::Handle(new VectorLagrangeFSpaceOriented<double>());
  if ( Data->dim==2 )
    FSpaceDisp = genFSpace<genTensor1<double> >::Handle(new VectorLagrangeFSpace<double>(VectorLagrangeFSpace<double>::VECTOR_X, VectorLagrangeFSpace<double>::VECTOR_Y));

  std::cout << "Displacement Field : iField=" << FSpaceDisp->getIncidentSpaceTag() << std::endl;

  genTerm<genTensor2<double> ,1>::Handle G(Gradient(FSpaceDisp)*0.5);
  genTerm<genTensor2<double> ,1>::Handle CG(new genCache<genTensor2<double> ,1>(G));
  EpsilonDisp = (CG+Transpose(CG));
}


void ElasticSolver::BuildFunctionSpaces()
{
  std::cout << *(DofIdManager::getInstance());

  for ( unsigned int i = 0; i < Data->BCs.size(); i++ )
  {
    if ((Data->BCs[i]->kind=="Dirichlet")||(Data->BCs[i]->kind==""))
    {
      if (Data->BCs[i]->What=="Displacement")
      {
        std::cout <<  "Dirichlet BC Disp" << std::endl;
        genFilterDofComponent filter ( Data->BCs[i]->comp1 );
        FixNodalDofs ( FSpaceDisp, Data->BCs[i]->begin(), Data->BCs[i]->end(), *pAssembler, *(Data->BCs[i]->fscalar), filter );
      }
    }
    else if (Data->BCs[i]->kind=="Periodic")
    {
      if (Data->BCs[i]->What=="Displacement")
      {
        std::cout <<  "Periodic Dirichlet BC Disp" << std::endl;
        genBoundaryCondition* BC_neg = Data->BCs[i];
        genBoundaryCondition* BC_pos = Data->BCs[i]->periodic;
        genSimpleFunction<genTensor1<double> >* mapping = Data->BCs[i]->fvector;
        genSimpleFunction<genTensor2<double> >* EpsilonH = Data->BCs[i]->periodic->ftensor;

        std::vector<MVertex*> vert_pos_selected;
        SelectPosVertexFromMapping( BC_neg->group()->vbegin(), BC_neg->group()->vend(),
                                    BC_pos->group()->vbegin(), BC_pos->group()->vend(),
                                    *mapping, vert_pos_selected);

        LinearCombinationNodalDofs( *FSpaceDisp,
                                    BC_neg->group()->vbegin(), BC_neg->group()->vend(),
                                    vert_pos_selected.begin(), vert_pos_selected.end(),
                                    *pAssembler, *EpsilonH);
      }
    }
  }

  // we number the dofs : when a dof is numbered, it cannot be numbered
  // again with another number.
  for ( unsigned int i = 0; i < EDomains.size(); ++i )
  {
    ElasticDomain* E = EDomains[i];
    std::cout << "Domain " << i << " : dim=" << E->dim << ", tag=" << E->tag << ", " << E->group()->size() << " elements" << std::endl;
    NumberDofs ( FSpaceDisp, E->begin(), E->end(), *pAssembler );
  }
}



void ElasticSolver::AssembleRHS()
{
  GaussQuadrature Integ_Boundary ( GaussQuadrature::Val );
  double volume=0;
  genTerm<genTensor0<double>,0>::Handle Volume(new ConstantField<genTensor0<double> >(1.0));

  // build the external force vector
  for ( unsigned int i = 0; i < Data->BCs.size(); i++ )
  {
    if ((Data->BCs[i]->kind=="Neumann")||(Data->BCs[i]->kind==""))
    {
      if (Data->BCs[i]->What=="Force")
      {
        volume=0;
        std::cout << "Neumann BC Force" << std::endl;
        genTerm<genTensor1<double> ,0>::Handle Func(new FunctionField<genTensor1<double> >(*(Data->BCs[i]->fvector)));
        genTerm<genTensor0<double>,1>::Handle loadterm = Compose<FullContrProdOp>(FSpaceDisp,Func);
        Assemble ( loadterm , Data->BCs[i]->begin(), Data->BCs[i]->end(), Integ_Boundary, *pAssembler );
        Assemble ( Volume, Data->BCs[i]->begin(), Data->BCs[i]->end(), Integ_Boundary, volume);
        printf("Support(%dD,%d) = %f [L^%d]\n", Data->BCs[i]->dim, Data->BCs[i]->tag, volume, Data->BCs[i]->dim);
      }
    }
  }
}


void ElasticSolver::AssembleLHS()
{
  double volume=0;
  genTerm<genTensor0<double>,0>::Handle Volume(new ConstantField<genTensor0<double> >(1.0));
  for (int i=0;i<EDomains.size();++i)
  {
    ElasticDomain* E = EDomains[i];

    // 1st methode
    genTerm<genTensor0<double>,2>::Handle Total = E->Energy<>(EpsilonDisp,EpsilonDisp);
    
    GaussQuadrature Integ_Bulk ( GaussQuadrature::GradGrad );
    Assemble ( Total, E->begin(), E->end(), Integ_Bulk, *pAssembler );
    volume=0;
    Assemble ( Volume,E->begin(), E->end(), Integ_Bulk,volume);
    printf("Support(%dD,%d) = %f [L^%d]\n", E->dim, E->tag, volume, E->dim);
    
    // 2nd methode
//     genTerm<genTensor2<double> ,1>::Handle G = Gradient(FSpaceDisp);
//     genTerm<genTensor2<double> ,1>::Handle B =  (G+Transpose(G))*0.5;
//     genTerm<genTensor2<double> ,1>::Handle CB ( new genCache<genTensor2<double> ,1>(B) ); // use cache
// 
//     genTerm<double,2>::Handle Mech = FullContractedProductCompose( Transpose(CB), E->Stress<1>(CB) );
// 
//     GaussQuadrature Integ_Bulk ( GaussQuadrature::GradGrad );
//     Assemble ( Mech, E->g()->begin(), E->g()->end(), Integ_Bulk, *pAssembler );

    
    // 3rd methode
//    genTerm<genTensor2<double> ,1> &G = *Gradient(diffTerm<genTensor1<double> ,1>::Handle(FSpaceDisp));
//    const genTerm<genTensor2<double> ,1> &B = (G+Transpose(G))*0.5;
//    genCache<genTensor2<double> ,1> CB(B); // use cache
//    genTerm<genTensor4<double> ,0>::ConstHandle C = E->Tangent<1>(EpsilonDisp);

//     BilinearTermContractWithLaw<genTensor2<double> > K(B,C,B);
//     GaussQuadrature Integ_Bulk ( GaussQuadrature::GradGrad );
//     Assemble ( K ,E->_g->begin(),E->_g->end(),Integ_Bulk,*pAssembler );

//     genTerm<double,2>::Handle BtCB = FullContractedProductCompose(Transpose(CB),FullContractedProductCompose(C,CB));
//     GaussQuadrature Integ_Bulk ( GaussQuadrature::GradGrad );
//     Assemble ( BtCB ,E->_g->begin(),E->_g->end(),Integ_Bulk,*pAssembler );

//  -_Test_Manager_---------------------------------------
//      std::shared_ptr<SavedGenTerm<genTensor2<double> ,0> > SaveStress(new SavedGenTerm<genTensor2<double> ,0>());
//      genTerm<genTensor2<double> ,0>::Handle SaveStress2(SaveStress);
//      std::shared_ptr<SavedGenTerm<genTensor2<double> ,0> > SaveStress3 = std::dynamic_pointer_cast<SavedGenTerm<genTensor2<double> ,0> >(SaveStress2);
//      SavedGenTerm<genTensor2<double> ,0>* SaveStress4 = &*SaveStress;

//      std::shared_ptr<SavedGenTerm<genTensor4<double> ,0> > saveC(new SavedGenTerm<genTensor4<double> ,0>());
//      GaussQuadrature Integ_Val ( GaussQuadrature::Val );
//      SavePtGauss(*C,E->g()->begin(), E->g()->end(),Integ_Val,*saveC);
//      savedGenTermManager.addSavedGenTerm("C",saveC,0,0,i);
//      savedGenTermManager.print();
//  ----------------------------------------------------
  }
}



void ElasticSolver::AssembleResidual()
{
//   linearSystemGmm<double>* buf= new linearSystemGmm<double>;
  linearSystemId<double>* buf= new linearSystemId<double>;
  dofManager<double>* pAssembler2 = new dofManager<double> ( buf );

  for ( unsigned int i = 0; i < Data->BCs.size(); i++ )
  {
    if ((Data->BCs[i]->kind=="Dirichlet")||(Data->BCs[i]->kind==""))
    {
      if (Data->BCs[i]->What=="Displacement")
      {
        genFilterDofComponent filter ( Data->BCs[i]->comp1 );
        FixNodalDofs ( FSpaceDisp, Data->BCs[i]->begin(), Data->BCs[i]->end(), *pAssembler2, *(Data->BCs[i]->fscalar), filter );
      }
    }
    else if (Data->BCs[i]->kind=="Periodic")
    {
      if (Data->BCs[i]->What=="Displacement")
      {
        std::cout <<  "Periodic Dirichlet BC Disp" << std::endl;
        genBoundaryCondition* BC_neg = Data->BCs[i];
        genBoundaryCondition* BC_pos = Data->BCs[i]->periodic;
        genSimpleFunction<genTensor1<double> >* mapping = Data->BCs[i]->fvector;
        genSimpleFunction<genTensor2<double> >* EpsilonH = Data->BCs[i]->periodic->ftensor;

        std::vector<MVertex*> vert_pos_selected;
        SelectPosVertexFromMapping( BC_neg->group()->vbegin(), BC_neg->group()->vend(),
                                    BC_pos->group()->vbegin(), BC_pos->group()->vend(),
                                    *mapping, vert_pos_selected);

        LinearCombinationNodalDofs( *FSpaceDisp,
                                     BC_neg->group()->vbegin(), BC_neg->group()->vend(),
                                     vert_pos_selected.begin(), vert_pos_selected.end(),
                                     *pAssembler2, *EpsilonH);
      }
    }
  }

  // we number the dofs : when a dof is numbered, it cannot be numbered
  // again with another number.
  for ( unsigned int i = 0; i < EDomains.size(); ++i )
  {
    NumberDofs ( FSpaceDisp, EDomains[i]->begin(), EDomains[i]->end(),*pAssembler2 );
  }

  for (int i=0;i<EDomains.size();++i)
  {
    ElasticDomain* E = EDomains[i];

    // 1st methode
    genTerm<genTensor2<double> ,1>::Handle G = Gradient(FSpaceDisp);
    genTerm<genTensor2<double> ,1>::Handle B = (G+Transpose(G))*0.5;

    diffTerm<genTensor1<double> ,0>::Handle Field ( new genSField<genTensor1<double> >(pAssembler, FSpaceDisp) );
    genTerm<genTensor2<double> ,0>::Handle GG = Gradient(Field);
    genTerm<genTensor2<double> ,0>::Handle BB = (GG+Transpose(GG))*0.5;

    genTerm<genTensor0<double>,1>::Handle Mech = Compose<FullContrProdOp>( Transpose(B), E->Stress<>(BB)); // FullContractedProductCompose( Transpose(B), E->Stress<0>(BB) );

    GaussQuadrature Integ_Bulk ( GaussQuadrature::GradGrad );
    Assemble ( Mech, E->begin(), E->end(), Integ_Bulk, *pAssembler2 );

    // 2nd methode
//    diffTerm<genTensor1<double> ,0>::Handle Field ( new genSField<genTensor1<double> >(pAssembler, FSpaceDisp) );
//     genTerm<genTensor2<double> ,0>::Handle GG = Gradient(Field);
//     genTerm<genTensor2<double> ,0>::Handle BB = (GG+Transpose(GG))*0.5;
//    GaussQuadrature Integ_Bulk( GaussQuadrature::GradGrad );
//     Assemble(*E->Energy<1,0>(EpsilonDisp,BB), E->g()->begin(), E->g()->end(), Integ_Bulk, *pAssembler2 );

    // 3rd methode;
//    genTerm<genTensor4<double> ,0>::Handle C = E->Tangent<0>(CB);
//    diffTerm<genTensor1<double> ,0>::Handle Field ( new genSField<genTensor1<double> >(pAssembler, FSpaceDisp) );
//    genTerm<genTensor2<double> ,1>::Handle G = Gradient(FSpaceDisp);
//    genTerm<genTensor2<double> ,1>::Handle B = (G+Transpose(G))*0.5;
//    genTerm<genTensor2<double> ,0>::Handle GG = Gradient(Field);
//    genTerm<genTensor2<double> ,0>::Handle BB = (GG+Transpose(GG))*0.5;
//    genTerm<double,1>::Handle BtCB = FullContractedProductCompose(Transpose(B),FullContractedProductCompose(C,BB));
//    Assemble ( *BtHB ,E->_g->begin(),E->_g->end(),Integ_Bulk,*pAssembler2 );
  }

  GaussQuadrature Integ_Boundary ( GaussQuadrature::Val );
  for ( unsigned int i = 0; i < Data->BCs.size(); i++ )
  {
    if ((Data->BCs[i]->kind=="Neumann")||(Data->BCs[i]->kind==""))
    {
      if (Data->BCs[i]->What=="Force")
      {
        genTerm<genTensor1<double>,0>::Handle Func(new FunctionField<genTensor1<double> >(*(Data->BCs[i]->fvector)));
        genTerm<genTensor0<double>,1>::Handle loadterm =  Compose<FullContrProdOp>(FSpaceDisp,Func)*-1.; //FullContractedProductCompose(FSpaceDisp,Func)*-1;
        
        Assemble ( loadterm , Data->BCs[i]->begin(), Data->BCs[i]->end(), Integ_Boundary, *pAssembler2 );
      }
    }
  }

//   FILE* f = fopen ( "residual.txt", "w" );
//   double valeur;
//   std::string sysname = "A";
//   for ( int i = 0 ; i < pAssembler2->sizeOfR() ; i ++ )
//   {
//     pAssembler2->getLinearSystem ( sysname )->getFromRightHandSide ( i,valeur );
//     fprintf ( f,"%+e\n",valeur ) ;
//   }
//   fclose ( f );

  pAssembler2->systemSolve();

  SavedUnknownTerm<genTensor1<double> > saveResidual(FSpaceDisp);
  for ( unsigned int i = 0; i < EDomains.size(); ++i )
  {
    SaveUnknown(*pAssembler2,EDomains[i]->begin(), EDomains[i]->end(),saveResidual);
  }
  saveResidual.printfile("saveResidual.txt");


  delete buf;
  delete pAssembler2;
}



void ElasticSolver::BuildLinearSystem()
{
  AssembleRHS();
  AssembleLHS();

  printf ( "nDofs=%d\n",pAssembler->sizeOfR() );
  printf ( "-- done assembling!\n" );

  if ( Data->solvertype == 1 )
  {
    exportKbCompressed();
//     exportKbToMatrixMarketFormat();
  }
}




void ElasticSolver::solve()
{
  linearSystem<double>* lsys=NULL;
  if ( Data->solvertype == 2 )
  {
#if defined(HAVE_TAUCS)
    lsys = new linearSystemCSRTaucs<double>;
#else
    printf ( "Taucs is not installed : Gmm is chosen to solve\n" );
    linearSystemCSRGmm<double>* buf= new linearSystemCSRGmm<double>;
    buf->setNoisy ( 2 );
    lsys=buf;
    Data->solvertype = 1;
#endif
  }
  else if ( Data->solvertype == 3 )
  {
#if defined(HAVE_PETSC)
    lsys = new linearSystemPETSc<double>;
#else
    printf ( "Petsc is not installed : Gmm is chosen to solve\n" );
    linearSystemCSRGmm<double>* buf= new linearSystemCSRGmm<double>;
    buf->setNoisy ( 2 );
    lsys=buf;
    Data->solvertype = 1;
#endif
  }
  else if ( Data->solvertype == 1 )
  {
    linearSystemCSRGmm<double>* buf= new linearSystemCSRGmm<double>;
    buf->setNoisy ( 2 );
    lsys=buf;
    Data->solvertype = 1;
  }


  if ( pAssembler ) delete pAssembler;
  pAssembler = new dofManager<double> ( lsys );

  printf ( "-- start solving\n" );
  CreateFunctionSpaces();
  BuildFunctionSpaces();
  BuildLinearSystem();

  pAssembler->systemSolve();
//  AssembleResidual();
  printf ( "-- done solving! \n" );

//  -_Test_SaveDof_---------------------------------------
//     SavedDiffTerm<genTensor1<double> > saveDof(FSpaceDisp);
//     for ( unsigned int i = 0; i < EDomains.size(); ++i )
//     {
//       SaveDof(*pAssembler,EDomains[i]->begin(), EDomains[i]->end(),saveDof);
//     }
//     saveDof.printfile("saveDof");

//  -_Test_SaveUnknown_---------------------------------------
//     SavedUnknownTerm<genTensor1<double> > saveUnknown(FSpaceDisp);
//     for ( unsigned int i = 0; i < EDomains.size(); ++i )
//     {
//       SaveUnknown(*pAssembler,EDomains[i]->_g->begin(), EDomains[i]->_g->end(),saveUnknown);
//     }
//     saveUnknown.printfile("saveUnknown");

//  -_Test_SaveModifUnknown_-----------------------------------
//     SavedUnknownTerm<genTensor1<double> > saveUnknown2(saveUnknown);
//     for ( unsigned int i = 0; i < EDomains.size(); ++i )
//     {
//       const genTerm<double,1>& saveUnknown_2 = saveUnknown+saveUnknown;
//       SaveModifUnknown(saveUnknown_2,EDomains[i]->_g->begin(), EDomains[i]->_g->end(),saveUnknown2);
//     }
//     saveUnknown2.printfile("saveUnknown*2");

//  -_Test_SaveSolution_---------------------------------------
//     std::string linSystName("A");
//     linearSystem<double>* linearSyst = pAssembler->getLinearSystem(linSystName);
//     linearSyst->zeroSolution();
//     SavedUnknownAddToSolution(saveUnknown2,*pAssembler);
//
//     SavedUnknownTerm<genTensor1<double> > saveSolution(FSpaceDisp);
//     for ( unsigned int i = 0; i < EDomains.size(); ++i )
//     {
//       SaveUnknown(*pAssembler,EDomains[i]->_g->begin(), EDomains[i]->_g->end(),saveSolution);
//     }
//     saveSolution.printfile("saveSolution");
//
//     SaveddiffTerm<genTensor1<double> > saveDof2(FSpaceDisp);
//     for ( unsigned int i = 0; i < EDomains.size(); ++i )
//     {
//       SaveDof(*pAssembler,EDomains[i]->_g->begin(), EDomains[i]->_g->end(),saveDof2);
//     }
//     saveDof2.printfile("saveDof2");
//  ----------------------------------------------------

  double energ=0;
  double volume=0;
  GaussQuadrature Integ_Bulk ( GaussQuadrature::GradGrad );
  genTerm<genTensor0<double>,0>::Handle Volume(new ConstantField<genTensor0<double> >(1.0));

  for ( unsigned int i = 0; i < EDomains.size(); i++ )
  {
    ElasticDomain* E = EDomains[i];

    diffTerm<genTensor1<double> ,0>::Handle Field ( new genSField<genTensor1<double> >(pAssembler, FSpaceDisp) );
    genTerm<genTensor2<double> ,0>::Handle G = Gradient(Field);
    genTerm<genTensor2<double> ,0>::Handle B = (G+Transpose(G))*0.5;
    genTerm<genTensor2<double> ,0>::Handle CB ( new genCache<genTensor2<double>,0>(B) ); // use cache
    
    genTerm<genTensor0<double> ,0>::Handle Total (Compose<FullContrProdOp>(Field,Field));
//    genTerm<double ,0>::Handle Total (FullContractedProductCompose(Field,Field)); // use cache
    genTerm<genTensor0<double>,0>::Handle Energy = E->Energy<>(CB,CB);
 //   GaussQuadrature Integ_Bulk( GaussQuadrature::GradGrad );
    Assemble ( Energy, E->begin(), E->end(), Integ_Bulk, energ);
    Assemble ( Volume, E->begin(), E->end(), Integ_Bulk, volume);

//     genTerm<genTensor4<double> ,0>::ConstHandle C = E->C;
//     genTerm<double,0>::Handle BtCB = FullContractedProductCompose(Transpose(CB),FullContractedProductCompose(C,CB));
//     Assemble ( *BtCB, E->begin(), E->end(), Integ_Bulk, energ);
  }
  printf("elastic energy=%f\n", energ/2.);
  printf("Total volume = %f [L^%d]\n", volume, Data->dim);

//   for ( unsigned int i = 0; i < EDomains.size(); i++ )
//   {
//     diffTerm<genTensor1<double> ,0>::Handle Field (new genSField<genTensor1<double> >(pAssembler, FSpaceDisp) );
//     SavedgenTerm<genTensor4<double> ,0>* H;
//     _savedgenTermManager.getSavedgenTerm("H",H,0,0,i);
//
//     const genTerm<genTensor2<double> ,0> &G=Gradient(Field);
//     const genTerm<genTensor2<double> ,0> &Strain=(G+Transpose(G))*0.5;
//     const genTerm<genTensor2<double> ,0> &Stress=FullContractedProductCompose(*H,Strain);
//
//     SavedgenTerm<genTensor2<double> ,0>* saveStress;
//     _savedgenTermManager.addSavedgenTerm("Stress",saveStress,0,0,i);
//
//     GaussQuadrature Integ_Val ( GaussQuadrature::Grad );
//     SavePtGauss(Stress,EDomains[i]->_g->begin(), EDomains[i]->_g->end(),Integ_Val,*saveStress);
//
//     //_savedgenTermManager.print();
//     //saveStress->print("saveStress");
//   }
//   printf ( "--SaveField--\n" );
}


void ElasticSolver::exportKb()
{
  FILE* f = fopen("K.txt", "w");
  double valeur;
  std::string sysname = "A";
  for (int i=0; i < pAssembler->sizeOfR(); ++i)
  {
    for (int j=0; j < pAssembler->sizeOfR(); ++j)
    {
      pAssembler->getLinearSystem(sysname)->getFromMatrix(i,j,valeur);
      if (valeur)
      fprintf(f, "%+e ", valeur);
    }
    fprintf(f ,"\n");
  }
  fclose(f);

  f = fopen("b.txt", "w");
  for ( int i=0 ; i < pAssembler->sizeOfR(); ++i)
  {
    pAssembler->getLinearSystem(sysname)->getFromRightHandSide(i,valeur);
    fprintf(f, "%+e\n", valeur) ;
  }
  fclose(f);
}

void ElasticSolver::exportKbCompressed()
{
  FILE* f = fopen("K.txt", "w");
  double valeur;
  std::string sysname = "A";
  for (int i=0; i < pAssembler->sizeOfR(); ++i)
  {
    bool first=true;
    int nz=0;
    for (int j=0; j < pAssembler->sizeOfR(); ++j)
    {
      pAssembler->getLinearSystem(sysname)->getFromMatrix(i,j,valeur);
      if (valeur!=0.)
      {
        if (nz>3) fprintf(f, "Z%d ", nz);
        else
          for (int k=0;k<nz;++k) fprintf(f, "%d ", 0);
        nz=0;
        fprintf(f, "%+e ", valeur);
      }
      else
        nz++;
    }
    if (nz>3) fprintf(f, "Z%d ", nz);
     else
      for (int k=0;k<nz;++k) fprintf(f, "%d ", 0);
    fprintf(f ,"\n");
  }
  fclose(f);

  f = fopen("b.txt", "w");
  for ( int i=0 ; i < pAssembler->sizeOfR(); ++i)
  {
    pAssembler->getLinearSystem(sysname)->getFromRightHandSide(i,valeur);
    fprintf(f, "%+e\n", valeur) ;
  }
  fclose(f);
}


void ElasticSolver::exportKbToMatrixMarketFormat()
{
  double valeur;
  std::string sysname = "A";
  long seek;
  int numVal;

  int size_i = pAssembler->sizeOfR();
  int size_j = pAssembler->sizeOfR();

  FILE* f = fopen("K.mtx", "w");
  fprintf(f, "%%%%MatrixMarket matrix coordinate real general\n");
  fprintf(f, "%%\n");
  fprintf(f, "%% MM File Characteristics :\n");
  fprintf(f, "%% http://people.sc.fsu.edu/~jburkardt/data/mm/mm.html\n");

  seek = ftell(f);
  fprintf(f, "%d %d %10d\n", size_i, size_j, 0);

  numVal=0;
  for (int j=0; j < size_j; ++j)
  {
    for (int i=0; i < size_i; ++i)
    {
      pAssembler->getLinearSystem(sysname)->getFromMatrix(i,j,valeur);
      if (valeur>1.e-100)
      {
        fprintf(f, "%d %d %+1.13e\n", i+1 ,j+1, valeur);
        ++numVal;
      }
    }
  }
  fseek(f, seek, SEEK_SET);
  fprintf(f, "%d %d %10d\n", size_i, size_j, numVal);
  fseek(f, 0, SEEK_END);
  fclose(f);


  f = fopen("b.mtx", "w");

  fprintf(f, "%%%%MatrixMarket matrix coordinate real general\n");
  fprintf(f, "%%\n");
  fprintf(f, "%% MM File Characteristics :\n");
  fprintf(f, "%% http://people.sc.fsu.edu/~jburkardt/data/mm/mm.html\n");


  seek = ftell(f);
  fprintf(f, "%d 2 %10d\n", size_i, 0);

  numVal=0;
  for ( int i=0 ; i < size_i; ++i)
  {
    pAssembler->getLinearSystem(sysname)->getFromRightHandSide(i,valeur);
    if (valeur>1.e-100)
      {
        fprintf(f, "%d 1 %+1.13e\n", i+1, valeur);
        ++numVal;
      }
  }
  fseek(f, seek, SEEK_SET);
  fprintf(f, "%d 2 %10d\n", size_i, numVal);
  fseek(f, 0, SEEK_END);
  fclose(f);
}


PView* ElasticSolver::buildDisplacementView(const std::string &postFileName)
{
  genTerm<genTensor1<double>,0>::ConstHandle Field(new genSField<genTensor1<double> >( pAssembler, FSpaceDisp ));
  return buildViewNodal(Field,EDomains,postFileName);
}

PView* ElasticSolver::buildElasticEnergyView(const std::string &postFileName)
{
  diffTerm<genTensor1<double> ,0>::Handle Field(new genSField<genTensor1<double> >( pAssembler, FSpaceDisp ));
  genTerm<genTensor2<double> ,0>::Handle G = Gradient(Field);
  genTerm<genTensor2<double> ,0>::Handle CG(new genCache<genTensor2<double>,0>(G));
  genTerm<genTensor2<double> ,0>::Handle B = (CG+Transpose(CG))*0.5;
  genTerm<genTensor2<double> ,0>::Handle CB(new genCache<genTensor2<double>,0>(B));

  std::vector<genTerm<genTensor0<double>,0>::ConstHandle> Energy;
  for ( unsigned int i = 0; i < EDomains.size(); i++ )
  {
    ElasticDomain* E = EDomains[i];
    Energy.push_back(E->Energy<>(CB,CB));
  }

  return buildViewElement(Energy, EDomains, postFileName);
}

PView* ElasticSolver::buildStressView(const std::string &postFileName)
{
  diffTerm<genTensor1<double>,0>::Handle Field(new genSField<genTensor1<double> >( pAssembler, FSpaceDisp ));
  genTerm<genTensor2<double>,0>::Handle G = Gradient(Field);
  genTerm<genTensor2<double>,0>::Handle CG(new genCache<genTensor2<double>,0>(G));
  genTerm<genTensor2<double>,0>::Handle B = (CG+Transpose(CG))*0.5;

  std::vector<genTerm<genTensor2<double>,0>::ConstHandle> Stress;
  for( unsigned int i = 0; i < EDomains.size(); i++ )
  {
    ElasticDomain* E = EDomains[i];
    Stress.push_back(E->Stress<>(B));
  }

  return buildViewElementNode(Stress, EDomains, postFileName);
//   return buildViewElement(Stress, EDomains, postFileName);
}

PView* ElasticSolver::buildStrainView(const std::string &postFileName)
{
  diffTerm<genTensor1<double>,0>::Handle Field(new genSField<genTensor1<double> >( pAssembler, FSpaceDisp ));
  genTerm<genTensor2<double>,0>::Handle G = Gradient(Field);
  genTerm<genTensor2<double>,0>::Handle CG(new genCache<genTensor2<double>,0>(G));
  genTerm<genTensor2<double>,0>::ConstHandle Strain = (CG+Transpose(CG))*0.5;

  return buildViewElementNode(Strain, EDomains, postFileName);
//   return buildViewElement(*Strain, EDomains, postFileName);
}