#include <boost/numeric/mtl/mtl.hpp>
#include "DOFVector.h"
#include "Traverse.h"
#include "DualTraverse.h"
#include "FixVec.h"

namespace AMDiS {

  template<>
  void DOFVector<double>::coarseRestrict(RCNeighbourList& list, int n)
  {
    switch (coarsenOperation) {
    case NO_OPERATION:
      return;
      break;
    case COARSE_RESTRICT:
      (const_cast<BasisFunction*>(feSpace->getBasisFcts()))->coarseRestr(this, &list, n);
      break;
    case COARSE_INTERPOL:
      if (feSpace == NULL || !feSpace)
	ERROR_EXIT("ERR1\n");

      if (feSpace->getBasisFcts() == NULL || !(feSpace->getBasisFcts()))
	ERROR_EXIT("ERR2\n");

      (const_cast<BasisFunction*>(feSpace->getBasisFcts()))->coarseInter(this, &list, n);
      break;
    default:
      ERROR_EXIT("invalid coarsen operation\n");
    }
  }

  template<>
  void DOFVector<double>::refineInterpol(RCNeighbourList& list, int n)
  {
    (const_cast<BasisFunction*>(feSpace->getBasisFcts()))->refineInter(this, &list, n);
  }

  template<>
  void DOFVector<WorldVector<double> >::refineInterpol(RCNeighbourList& list, int n)
  {
    if (n < 1) 
      return;

    Element *el = list.getElement(0);
    int n0 = feSpace->getAdmin()->getNumberOfPreDOFs(VERTEX);
    DegreeOfFreedom dof0 = el->getDOF(0, n0);
    DegreeOfFreedom dof1 = el->getDOF(1, n0);
    DegreeOfFreedom dof_new = el->getChild(0)->getDOF(feSpace->getMesh()->getDim(), n0);
    vec[dof_new] = vec[dof0];
    vec[dof_new] += vec[dof1];
    vec[dof_new] *= 0.5;
  }

  template<>
  DOFVector<WorldVector<double> >*
  DOFVector<double>::getGradient(DOFVector<WorldVector<double> > *grad) const 
  {
    FUNCNAME("DOFVector<double>::getGradient()");

    // define result vector
    static DOFVector<WorldVector<double> > *result = NULL;

    if (grad) {
      result = grad;
    } else {
      if(result && result->getFESpace() != feSpace) {
	delete result;
	result = new DOFVector<WorldVector<double> >(feSpace, "gradient");
      }
    }

    Mesh *mesh = feSpace->getMesh();

    int dim = mesh->getDim();

    const BasisFunction *basFcts = feSpace->getBasisFcts();

    DOFAdmin *admin = feSpace->getAdmin();

    // count number of nodes and dofs per node
    std::vector<int> numNodeDOFs;
    std::vector<int> numNodePreDOFs;
    std::vector<DimVec<double>*> bary;

    int numNodes = 0;
    int numDOFs = 0;

    for (int i = 0; i < dim + 1; i++) {
      GeoIndex geoIndex = INDEX_OF_DIM(i, dim);
      int numPositionNodes = mesh->getGeo(geoIndex);
      int numPreDOFs = admin->getNumberOfPreDOFs(i);
      for (int j = 0; j < numPositionNodes; j++) {
	int dofs = basFcts->getNumberOfDOFs(geoIndex);
	numNodeDOFs.push_back(dofs);
	numDOFs += dofs;
	numNodePreDOFs.push_back(numPreDOFs);
      }
      numNodes += numPositionNodes;
    }

    //    TEST_EXIT_DBG(numNodes == mesh->getNumberOfNodes())
    //      ("invalid number of nodes\n");

    TEST_EXIT_DBG(numDOFs == basFcts->getNumber())
      ("number of dofs != number of basis functions\n");
    
    for (int i = 0; i < numDOFs; i++) {
      bary.push_back(basFcts->getCoords(i));
    }

    // traverse mesh
    std::vector<bool> visited(getUsedSize(), false);

    TraverseStack stack;

    Flag fillFlag = Mesh::CALL_LEAF_EL | Mesh::FILL_GRD_LAMBDA | Mesh::FILL_COORDS;

    ElInfo *elInfo = stack.traverseFirst(mesh, -1, fillFlag);

    while (elInfo) {

      const DegreeOfFreedom **dof = elInfo->getElement()->getDOF();
      const double *localUh = getLocalVector(elInfo->getElement(), NULL);
      const DimVec<WorldVector<double> > &grdLambda = elInfo->getGrdLambda();

      int localDOFNr = 0;
      for (int i = 0; i < numNodes; i++) { // for all nodes
	for (int j = 0; j < numNodeDOFs[i]; j++) { // for all dofs at this node
	  DegreeOfFreedom dofIndex = dof[i][numNodePreDOFs[localDOFNr] + j];
	  if (!visited[dofIndex]) {	  
	    basFcts->evalGrdUh(*(bary[localDOFNr]), grdLambda, 
			       localUh, &((*result)[dofIndex]));

	    visited[dofIndex] = true;
	  }
	  localDOFNr++;
	}
      }

      elInfo = stack.traverseNext(elInfo);
    }

    return result;
  }

  template<>
  DOFVector<WorldVector<double> >*
  DOFVector<double>::getRecoveryGradient(DOFVector<WorldVector<double> > *grad) const 
  {
    FUNCNAME("DOFVector<double>::getRecoveryGradient()");

    // define result vector
    static DOFVector<WorldVector<double> > *vec = NULL;

    DOFVector<WorldVector<double> > *result = grad;

    if (!result) {
      if (vec && vec->getFESpace() != feSpace) {
	delete vec;
	vec = NULL;
      }
      if (!vec) {
	vec = new DOFVector<WorldVector<double> >(feSpace, "gradient");
      }
      result = vec;
    }

    result->set(WorldVector<double>(DEFAULT_VALUE, 0.0));

    DOFVector<double> volume(feSpace, "volume");
    volume.set(0.0);

    const BasisFunction *basFcts = feSpace->getBasisFcts();
    int nPreDOFs = feSpace->getAdmin()->getNumberOfPreDOFs(0);
    DimVec<double> bary(dim, DEFAULT_VALUE, (1.0 / (dim + 1.0)));
    WorldVector<double> grd;

    // traverse mesh
    Mesh *mesh = feSpace->getMesh();
    TraverseStack stack;
    ElInfo *elInfo = stack.traverseFirst(mesh, -1,
					 Mesh::CALL_LEAF_EL | Mesh::FILL_DET | 
					 Mesh::FILL_GRD_LAMBDA | Mesh::FILL_COORDS);

    while (elInfo) {
      double det = elInfo->getDet();
      const DegreeOfFreedom **dof = elInfo->getElement()->getDOF();
      const double *localUh = getLocalVector(elInfo->getElement(), NULL);
      const DimVec<WorldVector<double> > &grdLambda = elInfo->getGrdLambda();
      basFcts->evalGrdUh(bary, grdLambda, localUh, &grd);

      for (int i = 0; i < dim + 1; i++) {
	DegreeOfFreedom dofIndex = dof[i][nPreDOFs];
	(*result)[dofIndex] += grd * det;
	volume[dofIndex] += det;
      }

      elInfo = stack.traverseNext(elInfo);
    }

    DOFVector<double>::Iterator volIt(&volume, USED_DOFS);
    DOFVector<WorldVector<double> >::Iterator grdIt(result, USED_DOFS);

    for (volIt.reset(), grdIt.reset(); !volIt.end(); ++volIt, ++grdIt) {
      if (*volIt != 0.0) {
	*grdIt *= 1.0 / (*volIt);
      }
    }

    return result;
  }

  template<>
  const WorldVector<double> *DOFVectorBase<double>::getGrdAtQPs(const ElInfo *elInfo, 
								const Quadrature *quad,
								const FastQuadrature *quadFast,
								WorldVector<double> *grdAtQPs) const
  {
    FUNCNAME("DOFVector<double>::getGrdAtQPs()");
  
    TEST_EXIT_DBG(quad || quadFast)("neither quad nor quadFast defined\n");

    if (quad && quadFast) {
      TEST_EXIT_DBG(quad == quadFast->getQuadrature())
      	("quad != quadFast->quadrature\n");
    }

    TEST_EXIT_DBG(!quadFast || quadFast->getBasisFunctions() == feSpace->getBasisFcts())
      ("invalid basis functions");

    int dow = Global::getGeo(WORLD);
    int myRank = omp_get_thread_num();
    int nPoints = quadFast ? quadFast->getQuadrature()->getNumPoints() : quad->getNumPoints();
    static WorldVector<double> *grd = NULL;
    WorldVector<double> *result;

    if (grdAtQPs) {
      result = grdAtQPs;
    } else {
      if (grd) 
	delete [] grd;

      grd = new WorldVector<double>[nPoints];
      for (int i = 0; i < nPoints; i++) {
	grd[i].set(0.0);
      }
      result = grd;
    }
  
    double *localVec = localVectors[myRank];
    getLocalVector(elInfo->getElement(), localVec);

    DimVec<double> &grd1 = *grdTmp[myRank];
    int parts = Global::getGeo(PARTS, dim);
    const DimVec<WorldVector<double> > &grdLambda = elInfo->getGrdLambda();

    if (quadFast) {
      for (int i = 0; i < nPoints; i++) {
	for (int j = 0; j < dim + 1; j++)
	  grd1[j] = 0.0;

	for (int j = 0; j < nBasFcts; j++)
	  for (int k = 0; k < parts; k++)
	    grd1[k] += quadFast->getGradient(i, j, k) * localVec[j];
	  
	for (int l=0; l < dow; l++) {
	  result[i][l] = 0.0;
	  for (int k = 0; k < parts; k++)
	    result[i][l] += grdLambda[k][l] * grd1[k];
	}
      }

    } else {      
      const BasisFunction *basFcts = feSpace->getBasisFcts();
      DimVec<double>* grdPhi = grdPhis[myRank];

      for (int i = 0; i < nPoints; i++) {
	for (int j = 0; j < dim + 1; j++)
	  grd1[j] = 0.0;

	for (int j = 0; j < nBasFcts; j++) {
	  (*(basFcts->getGrdPhi(j)))(quad->getLambda(i), *grdPhi);
	  for (int k = 0; k < parts; k++)
	    grd1[k] += (*grdPhi)[k] * localVec[j];
	}

	for (int l = 0; l < dow; l++) {
	  result[i][l] = 0.0;
	  for (int k = 0; k < parts; k++)
	    result[i][l] += grdLambda[k][l] * grd1[k];
	}
      }
    }

    return const_cast<const WorldVector<double>*>(result);
  }

  template<>
  const WorldVector<double> *DOFVectorBase<double>::getGrdAtQPs(const ElInfo *smallElInfo,
								const ElInfo *largeElInfo,
								const Quadrature *quad,
								const FastQuadrature *quadFast,
								WorldVector<double> *grdAtQPs) const
  {
    FUNCNAME("DOFVector<double>::getGrdAtQPs()");
  
    TEST_EXIT_DBG(quad || quadFast)("neither quad nor quadFast defined\n");

    if (quad && quadFast)
      TEST_EXIT_DBG(quad == quadFast->getQuadrature())("quad != quadFast->quadrature\n");

    TEST_EXIT_DBG(!quadFast || quadFast->getBasisFunctions() == feSpace->getBasisFcts())
      ("invalid basis functions");

    int dow = Global::getGeo(WORLD);
    int myRank = omp_get_thread_num();
    int nPoints = quadFast ? quadFast->getQuadrature()->getNumPoints() : quad->getNumPoints();
    static WorldVector<double> *grd = NULL;
    WorldVector<double> *result;

    if (grdAtQPs) {
      result = grdAtQPs;
    } else {
      if (grd) 
	delete [] grd;

      grd = new WorldVector<double>[nPoints];
      for (int i = 0; i < nPoints; i++)
	grd[i].set(0.0);

      result = grd;
    }
  
    double *localVec = localVectors[myRank];
    getLocalVector(largeElInfo->getElement(), localVec);

    const BasisFunction *basFcts = feSpace->getBasisFcts();    
    mtl::dense2D<double> m(nBasFcts, nBasFcts);
    smallElInfo->getSubElemCoordsMat(m, basFcts->getDegree());

    DimVec<double> &grd1 = *grdTmp[myRank];
    int parts = Global::getGeo(PARTS, dim);
    const DimVec<WorldVector<double> > &grdLambda = largeElInfo->getGrdLambda();

    DimVec<double>* grdPhi = grdPhis[myRank];
    DimVec<double> tmp(dim, DEFAULT_VALUE, 0.0);
    
    for (int i = 0; i < nPoints; i++) {
      for (int j = 0; j < dim + 1; j++)
	grd1[j] = 0.0;
      
      for (int j = 0; j < nBasFcts; j++) {

	grdPhi->set(0.0);
	for (int k = 0; k < nBasFcts; k++) {
	  (*(basFcts->getGrdPhi(k)))(quad->getLambda(i), tmp);
	  tmp *= m[j][k];
	  *grdPhi += tmp;
	}

	for (int k = 0; k < parts; k++)
	  grd1[k] += (*grdPhi)[k] * localVec[j];
      }
      
      for (int l = 0; l < dow; l++) {
	result[i][l] = 0.0;
	for (int k = 0; k < parts; k++)
	  result[i][l] += grdLambda[k][l] * grd1[k];
      }
    }    
  
    return const_cast<const WorldVector<double>*>(result);
  }

  template<>
  const WorldMatrix<double> *DOFVectorBase<double>::getD2AtQPs(const ElInfo *elInfo, 
							       const Quadrature *quad,
							       const FastQuadrature *quadFast,
							       WorldMatrix<double>  *d2AtQPs) const
  {
    FUNCNAME("DOFVector<double>::getD2AtQPs()");
  
    TEST_EXIT_DBG(quad || quadFast)("neither quad nor quadFast defined\n");

    if (quad && quadFast) {
      TEST_EXIT_DBG(quad == quadFast->getQuadrature())
      	("quad != quadFast->quadrature\n");
    }

    TEST_EXIT_DBG(!quadFast || quadFast->getBasisFunctions() == feSpace->getBasisFcts())
      ("invalid basis functions");

    Element *el = elInfo->getElement(); 

    int myRank = omp_get_thread_num();
    int dow = Global::getGeo(WORLD);
    int nPoints = quadFast ? quadFast->getQuadrature()->getNumPoints() : quad->getNumPoints();

    static WorldMatrix<double> *vec = NULL;
    WorldMatrix<double> *result;

    if (d2AtQPs) {
      result = d2AtQPs;
    } else {
      if(vec) delete [] vec;
      vec = new WorldMatrix<double>[nPoints];
      for (int i = 0; i < nPoints; i++) {
	vec[i].set(0.0);
      }
      result = vec;
    }
  
    double *localVec = localVectors[myRank];
    getLocalVector(el, localVec);

    DimMat<double> D2Tmp(dim, DEFAULT_VALUE, 0.0);
    int parts = Global::getGeo(PARTS, dim);
    const DimVec<WorldVector<double> > &grdLambda = elInfo->getGrdLambda();

    if (quadFast) {
      for (int iq = 0; iq < nPoints; iq++) {
	for (int k = 0; k < parts; k++)
	  for (int l = 0; l < parts; l++)
	    D2Tmp[k][l] = 0.0;

	for (int i = 0; i < nBasFcts; i++) {
	  for (int k = 0; k < parts; k++)
	    for (int l = 0; l < parts; l++)
	      D2Tmp[k][l] += localVec[i] * quadFast->getSecDer(iq, i, k, l);
	}

	for (int i = 0; i < dow; i++)
	  for (int j = 0; j < dow; j++) {
	    result[iq][i][j] = 0.0;
	    for (int k = 0; k < parts; k++)
	      for (int l = 0; l < parts; l++)
		result[iq][i][j] += grdLambda[k][i]*grdLambda[l][j]*D2Tmp[k][l];
	  }
      }
    } else {
      const BasisFunction *basFcts = feSpace->getBasisFcts();
      DimMat<double>* D2Phi = D2Phis[omp_get_thread_num()];

      for (int iq = 0; iq < nPoints; iq++) {
	for (int k = 0; k < parts; k++)
	  for (int l = 0; l < parts; l++)
	    D2Tmp[k][l] = 0.0;

	for (int i = 0; i < nBasFcts; i++) {
	  WARNING("not tested after index correction\n");
	  (*(basFcts->getD2Phi(i)))(quad->getLambda(iq), *D2Phi);

	  for (int k = 0; k < parts; k++)
	    for (int l = 0; l < parts; l++)
	      D2Tmp[k][l] += localVec[i] * (*D2Phi)[k][l];
	}

	for (int i = 0; i < dow; i++)
	  for (int j = 0; j < dow; j++) {
	    result[iq][i][j] = 0.0;
	    for (int k = 0; k < parts; k++)
	      for (int l = 0; l < parts; l++)
		result[iq][i][j] += grdLambda[k][i] * grdLambda[l][j] * D2Tmp[k][l];
	  }
      }
    }

    return const_cast<const WorldMatrix<double>*>(result);
  }

  template<>
  void DOFVector<double>::interpol(DOFVector<double> *source, double factor) 
  {
    FUNCNAME("DOFVector<double>::interpol()");

    const FiniteElemSpace *sourceFeSpace = source->getFESpace();
    const BasisFunction *basisFcts = feSpace->getBasisFcts();
    const BasisFunction *sourceBasisFcts = sourceFeSpace->getBasisFcts();

    int nBasisFcts = basisFcts->getNumber();
    int nSourceBasisFcts = sourceBasisFcts->getNumber();

    this->set(0.0);

    DegreeOfFreedom *myLocalIndices = localIndices[omp_get_thread_num()];
    double *sourceLocalCoeffs = new double[nSourceBasisFcts];

    if (feSpace->getMesh() == sourceFeSpace->getMesh()) {
      DimVec<double> *coords = NULL;
      TraverseStack stack;
      ElInfo *elInfo = stack.traverseFirst(feSpace->getMesh(), -1,
					   Mesh::CALL_LEAF_EL | 
					   Mesh::FILL_COORDS);

      while (elInfo) {
	Element *el = elInfo->getElement();

	basisFcts->getLocalIndices(el, feSpace->getAdmin(), myLocalIndices);
	source->getLocalVector(el, sourceLocalCoeffs);

	for (int i = 0; i < nBasisFcts; i++) {
	  if (vec[myLocalIndices[i]] == 0.0) {
	    coords = basisFcts->getCoords(i);
	    vec[myLocalIndices[i]] = sourceBasisFcts->evalUh(*coords, sourceLocalCoeffs) * factor;
	  }
	}
	elInfo = stack.traverseNext(elInfo);
      }
    } else {
      DimVec<double> coords2(feSpace->getMesh()->getDim(), NO_INIT);
      DualTraverse dualStack;
      ElInfo *elInfo1, *elInfo2;
      ElInfo *elInfoSmall, *elInfoLarge;
      WorldVector<double> worldVec;

      bool nextTraverse = dualStack.traverseFirst(feSpace->getMesh(),
						  sourceFeSpace->getMesh(),
						  -1, -1,
						  Mesh::CALL_LEAF_EL | Mesh::FILL_COORDS,
						  Mesh::CALL_LEAF_EL | Mesh::FILL_COORDS,
						  &elInfo1, &elInfo2,
						  &elInfoSmall, &elInfoLarge);
      while (nextTraverse) {     
	basisFcts->getLocalIndices(elInfo1->getElement(), 
				   feSpace->getAdmin(), 
				   myLocalIndices);
	source->getLocalVector(elInfo2->getElement(), 
			       sourceLocalCoeffs);

	for (int i = 0; i < nBasisFcts; i++) {
	  if (vec[myLocalIndices[i]] == 0.0) {
            elInfo1->coordToWorld(*(basisFcts->getCoords(i)), worldVec);
	    elInfo2->worldToCoord(worldVec, &coords2);
	  
	    bool isPositive = true;
	    for (int j = 0; j < coords2.size(); j++) {
	      if (coords2[j] < 0) {
		isPositive = false;
		break;
	      }
	    }
	  
	    if (isPositive) {
	      vec[myLocalIndices[i]] = sourceBasisFcts->evalUh(coords2, sourceLocalCoeffs);	    
	    }	
	  }
	}
      
	nextTraverse = dualStack.traverseNext(&elInfo1, &elInfo2,
					      &elInfoSmall, &elInfoLarge);
      }
    }
  
    delete [] sourceLocalCoeffs;
  }


  template<>
  void DOFVector<WorldVector<double> >::interpol(DOFVector<WorldVector<double> > *v, double factor) 
  {
    WorldVector<double> nul(DEFAULT_VALUE,0.0);

    this->set(nul);

    DimVec<double> *coords = NULL;
    const FiniteElemSpace *vFESpace = v->getFESpace();

    if (feSpace == vFESpace)
      WARNING("same FE-spaces\n");

    const BasisFunction *basFcts = feSpace->getBasisFcts();
    const BasisFunction *vBasFcts = vFESpace->getBasisFcts();

    int numBasFcts = basFcts->getNumber();
    int vNumBasFcts = vBasFcts->getNumber();

    if (feSpace->getMesh() == vFESpace->getMesh()) {
      DegreeOfFreedom *myLocalIndices = localIndices[omp_get_thread_num()];
      WorldVector<double> *vLocalCoeffs = new WorldVector<double>[vNumBasFcts];
      Mesh *mesh = feSpace->getMesh();
      TraverseStack stack;
      ElInfo *elInfo = stack.traverseFirst(mesh, -1,
					   Mesh::CALL_LEAF_EL | 
					   Mesh::FILL_COORDS);

      while (elInfo) {
	Element *el = elInfo->getElement();

	basFcts->getLocalIndices(el, feSpace->getAdmin(), myLocalIndices);

	v->getLocalVector(el, vLocalCoeffs);

	for (int i = 0; i < numBasFcts; i++) {
	  if (vec[myLocalIndices[i]] == nul) {
	    coords = basFcts->getCoords(i);
	    vec[myLocalIndices[i]] += vBasFcts->evalUh(*coords, vLocalCoeffs, NULL) * factor;
	  }
	}
	elInfo = stack.traverseNext(elInfo);
      }

      delete [] vLocalCoeffs;
    } else {
      ERROR_EXIT("not yet for dual traverse\n");
    }
  }


  template<>
  WorldVector<DOFVector<double>*> *DOFVector<double>::getGradient(WorldVector<DOFVector<double>*> *grad) const
  {
    FUNCNAME("DOFVector<double>::getGradient()");

    Mesh *mesh = feSpace->getMesh();
    int dim = mesh->getDim();
    int dow = Global::getGeo(WORLD);

    const BasisFunction *basFcts = feSpace->getBasisFcts();

    DOFAdmin *admin = feSpace->getAdmin();

    // define result vector
    static WorldVector<DOFVector<double>*> *result = NULL;

    if (grad) {
      result = grad;
    } else {
      if (!result) {
	result = new WorldVector<DOFVector<double>*>;

	result->set(NULL);
      }
      for (int i = 0; i < dow; i++) {
	if ((*result)[i] && (*result)[i]->getFESpace() != feSpace) {
	  delete (*result)[i];
	  (*result)[i] = new DOFVector<double>(feSpace, "gradient");
	}
      }
    }

    // count number of nodes and dofs per node
    std::vector<int> numNodeDOFs;
    std::vector<int> numNodePreDOFs;
    std::vector<DimVec<double>*> bary;

    int numNodes = 0;
    int numDOFs = 0;

    for (int i = 0; i < dim + 1; i++) {
      GeoIndex geoIndex = INDEX_OF_DIM(i, dim);
      int numPositionNodes = mesh->getGeo(geoIndex);
      int numPreDOFs = admin->getNumberOfPreDOFs(i);
      for (int j = 0; j < numPositionNodes; j++) {
	int dofs = basFcts->getNumberOfDOFs(geoIndex);
	numNodeDOFs.push_back(dofs);
	numDOFs += dofs;
	numNodePreDOFs.push_back(numPreDOFs);
      }
      numNodes += numPositionNodes;
    }

//     TEST_EXIT_DBG(numNodes == mesh->getNumberOfNodes())
//       ("invalid number of nodes\n");

    TEST_EXIT_DBG(numDOFs == basFcts->getNumber())
      ("number of dofs != number of basis functions\n");
    
    for (int i = 0; i < numDOFs; i++) {
      bary.push_back(basFcts->getCoords(i));
    }

    // traverse mesh
    std::vector<bool> visited(getUsedSize(), false);
    TraverseStack stack;
    Flag fillFlag = Mesh::CALL_LEAF_EL | Mesh::FILL_GRD_LAMBDA | Mesh::FILL_COORDS;
    ElInfo *elInfo = stack.traverseFirst(mesh, -1, fillFlag);
    WorldVector<double> grd;

    while (elInfo) {

      const DegreeOfFreedom **dof = elInfo->getElement()->getDOF();
      const double *localUh = getLocalVector(elInfo->getElement(), NULL);
      const DimVec<WorldVector<double> > &grdLambda = elInfo->getGrdLambda();

      int localDOFNr = 0;
      for (int i = 0; i < numNodes; i++) { // for all nodes
	for (int j = 0; j < numNodeDOFs[i]; j++) { // for all dofs at this node
	  DegreeOfFreedom dofIndex = dof[i][numNodePreDOFs[localDOFNr] + j];

	  if (!visited[dofIndex]) {
	    basFcts->evalGrdUh(*(bary[localDOFNr]), grdLambda, localUh, &grd);

	    for (int k = 0; k < dow; k++) {
	      (*(*result)[k])[dofIndex] = grd[k];
	    }

	    visited[dofIndex] = true;
	  }
	  localDOFNr++;
	}
      }

      elInfo = stack.traverseNext(elInfo);
    }

    return result;
  }


  DOFVectorDOF::DOFVectorDOF() : 
    DOFVector<DegreeOfFreedom>() 
  {}

  void DOFVectorDOF::freeDOFContent(DegreeOfFreedom dof) 
  {
    std::vector<DegreeOfFreedom>::iterator it;
    std::vector<DegreeOfFreedom>::iterator end = vec.end();
    DegreeOfFreedom pos = 0;
    for (it = vec.begin(); it != end; ++it, ++pos)
      if (*it == dof) *it = pos;
  }

  WorldVector<DOFVector<double>*> *transform(DOFVector<WorldVector<double> > *vec,
					     WorldVector<DOFVector<double>*> *res)
  {
    FUNCNAME("DOFVector<double>::transform()");

    TEST_EXIT_DBG(vec)("no vector\n");

    int dow = Global::getGeo(WORLD);
    static WorldVector<DOFVector<double>*> *result = NULL;

    if (!res && !result) {
      result = new WorldVector<DOFVector<double>*>;
      for (int i = 0; i < dow; i++)
	(*result)[i] = new DOFVector<double>(vec->getFESpace(), "transform");
    }

    WorldVector<DOFVector<double>*> *r = res ? res : result;

    int vecSize = vec->getSize();
    for (int i = 0; i < vecSize; i++)
      for (int j = 0; j < dow; j++)
	(*((*r)[j]))[i] = (*vec)[i][j];

    return r;
  }

  template<>
  const double *DOFVectorBase<double>::getVecAtQPs(const ElInfo *smallElInfo, 
						   const ElInfo *largeElInfo,
						   const Quadrature *quad,
						   const FastQuadrature *quadFast,
						   double *vecAtQPs) const
  {
    FUNCNAME("DOFVector<double>::getVecAtQPs()");
  
    TEST_EXIT_DBG(quad || quadFast)("neither quad nor quadFast defined\n");

    if (quad && quadFast) {
      TEST_EXIT_DBG(quad == quadFast->getQuadrature())
      	("quad != quadFast->quadrature\n");
    }

    TEST_EXIT_DBG(!quadFast || quadFast->getBasisFunctions() == feSpace->getBasisFcts())
      ("invalid basis functions");

    const BasisFunction *basFcts = feSpace->getBasisFcts();
    int nPoints = quadFast ? quadFast->getQuadrature()->getNumPoints() : quad->getNumPoints(); 
    static double *localvec = NULL;
    double *result;

    if (vecAtQPs) {
      result = vecAtQPs;
    } else {
      if (localvec) 
	delete [] localvec;
      localvec = new double[nPoints];
      for (int i = 0; i < nPoints; i++) {
	localvec[i] = 0.0;
      }
      result = localvec;
    }
      
    double *localVec = localVectors[omp_get_thread_num()];
    getLocalVector(largeElInfo->getElement(), localVec);

    mtl::dense2D<double> m(nBasFcts, nBasFcts);    
    smallElInfo->getSubElemCoordsMat(m, basFcts->getDegree());

    for (int i = 0; i < nPoints; i++) {
      result[i] = 0.0;
      for (int j = 0; j < nBasFcts; j++) {
	double val = 0.0;
	for (int k = 0; k < nBasFcts; k++) {
	  val += m[j][k] * (*(basFcts->getPhi(k)))(quad->getLambda(i));
	}
	result[i] += localVec[j] * val;
      }
    }

    return const_cast<const double*>(result);
  }

  template<>
  void DOFVectorBase<double>::assemble(double factor, ElInfo *elInfo,
				       const BoundaryType *bound, 
				       Operator *op)
  {
    FUNCNAME("DOFVector::assemble()");

    if (!(op || this->operators.size())) 
      return;

    set_to_zero(this->elementVector);

    if (op) {
      op->getElementVector(elInfo, this->elementVector);
    } else {
      std::vector<Operator*>::iterator it;
      std::vector<double*>::iterator factorIt;

      for (it = this->operators.begin(), factorIt = this->operatorFactor.begin();	
	   it != this->operators.end(); 
	   ++it, ++factorIt)
	if ((*it)->getNeedDualTraverse() == false)
	  (*it)->getElementVector(elInfo, this->elementVector, 
				  *factorIt ? **factorIt : 1.0);      
    }

    addElementVector(factor, this->elementVector, bound, elInfo);
  }

  template<>
  void DOFVectorBase<double>::assemble2(double factor, 
					ElInfo *mainElInfo, ElInfo *auxElInfo,
					ElInfo *smallElInfo, ElInfo *largeElInfo,
					const BoundaryType *bound, 
					Operator *op)
  {
    FUNCNAME("DOFVector::assemble2()");

    if (!(op || this->operators.size())) 
      return;

    set_to_zero(this->elementVector);

    if (op) {
      ERROR_EXIT("TODO");
      //      op->getElementVector(mainElInfo, this->elementVector);
    } else {
      std::vector<Operator*>::iterator it;
      std::vector<double*>::iterator factorIt;
      for (it = this->operators.begin(), factorIt = this->operatorFactor.begin();	
	   it != this->operators.end(); 
	   ++it, ++factorIt) {
	if ((*it)->getNeedDualTraverse()) {
	  (*it)->getElementVector(mainElInfo, auxElInfo,
				  smallElInfo, largeElInfo,
				  this->elementVector, 
				  *factorIt ? **factorIt : 1.0);
	}
      }
    }
  

    addElementVector(factor, this->elementVector, bound, mainElInfo);
  }


}