Error.hh 7.53 KB
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#include "Mesh.h"
#include "Parametric.h"
#include "Quadrature.h"
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#include "Traverse.h"
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namespace AMDiS {

  template<typename T>
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  T Error<T>::errUFct(const DimVec<double>& lambda)
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  {
    WorldVector<double> x;
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    elinfo->coordToWorld(lambda, x);
    return ((*pU)(x));
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  }

  template<typename T>
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  WorldVector<T> Error<T>::grdErrUFct(const DimVec<double>& lambda)
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  {
    WorldVector<double> x;
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    elinfo->coordToWorld(lambda, x);
    return ((*pGrdU)(x));
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  }

  template<typename T>
  double Error<T>::maxErrAtQp(const AbstractFunction<T, WorldVector<double> >& u,
			      const DOFVector<T>& uh,
			      const Quadrature* q)
  {
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    FUNCNAME("Error<T>::maxErrAtQp()");
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    const FiniteElemSpace *fe_space;
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    if (!(pU = &u)) {
      ERROR("no function u specified; doing nothing\n");
      return(-1.0);
    }
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    if (!(errUh = &uh) || !(fe_space = uh->getFESpace())) {
      ERROR("no discrete function or no fe_space for it; doing nothing\n");
      return(-1.0);
    }
    if (!(basFct = fe_space->getBasisFcts())) {
      ERROR("no basis functions at discrete solution ; doing nothing\n");
      return(-1.0);
    }
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    if (!q)
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      q = Quadrature::provideQuadrature(fe_space->getMesh()->getDim(),
					2 * fe_space->getBasisFcts()->getDegree() -  2);
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    quadFast = FastQuadrature::provideFastQuadrature(basFct, *q, INIT_PHI);
    double maxErr = 0.0;
    TraverseStack stack;
    ElInfo *elInfo = stack.traverseFirst(fe_space->getMesh(), -1,
					 Mesh::FILL_COORDS | Mesh::CALL_LEAF_EL);
    while (elInfo) {
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      elinfo = elInfo;
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      double err = 0.0;
      const double *u_vec, *uh_vec;
      
      u_vec = quadFast->getQuadrature()->fAtQp(errU, NULL);
      uh_vec = errUh->getVecAtQPs(elInfo, NULL, quadFast, NULL);
      
      int nPoints = quadFast->getNumPoints();
      for (int i = 0; i < nPoints; i++) {
	err = u_vec[i] > uh_vec[i] ? u_vec[i] - uh_vec[i] : uh_vec[i] - u_vec[i];
	maxErr = max(maxErr, err);
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      }

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      elInfo = stack.traverseNext(elInfo);
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    }

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    return maxErr;
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  }

  template<typename T>
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  double Error<T>::H1Err(const AbstractFunction<WorldVector<T>, WorldVector<double> > &grdU,
			 const DOFVector<T> &uh,
			 int relErr,
			 double* max,
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			 bool writeLeafData,
			 int comp)
  {
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    FUNCNAME("Error<T>::H1Err()");

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    const FiniteElemSpace *fe_space;
    writeInLeafData = writeLeafData;
    component = comp;
    Quadrature *q = NULL;
    pGrdU = &grdU;
    errUh = &uh;

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    if (!(fe_space = uh.getFESpace())) {
      ERROR("no fe_space for uh; doing nothing\n");
      return(0.0);
    }
    if (!(basFct = fe_space->getBasisFcts())) {
      ERROR("no basis functions at discrete solution ; doing nothing\n");
      return(0.0);
    }
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    int dim = fe_space->getMesh()->getDim();
    int deg = grdU.getDegree();
    int degree = deg ? deg : 2 * fe_space->getBasisFcts()->getDegree() - 2;

    q = Quadrature::provideQuadrature(dim, degree);
    quadFast = FastQuadrature::provideFastQuadrature(basFct, 
						     *q, 
						     INIT_GRD_PHI);

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    double relative = relErr;
    double maxErr = 0.0, h1Err2 = 0.0, h1Norm2 = 0.0;


    TraverseStack stack;
    ElInfo *elInfo = stack.traverseFirst(fe_space->getMesh(), -1,
					 Mesh::FILL_COORDS |
					 Mesh::CALL_LEAF_EL |
					 Mesh::FILL_DET | 
					 Mesh::FILL_GRD_LAMBDA);
    while (elInfo) {
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      elinfo = elInfo;
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      int i, j;
      double err, err_2, h1_err_el, norm_el, norm2, det, exact;
      const WorldVector<double> *grdu_vec, *grduh_vec;
      
      grdu_vec = quadFast->getQuadrature()->grdFAtQp(grdErrU, NULL);
      det = elInfo->getDet();
      grduh_vec = errUh->getGrdAtQPs(elinfo, NULL, quadFast, NULL);
      
      int nPoints = quadFast->getNumPoints();
      int dow = Global::getGeo(WORLD);
      
      for (h1_err_el = i = 0; i < nPoints; i++) {
	for (err_2 = j = 0; j < dow; j++) {
	  err = grdu_vec[i][j] - grduh_vec[i][j];
	  err_2 += sqr(err);
	}
	h1_err_el += quadFast->getWeight(i)*err_2;
      }
      
      exact = det*h1_err_el;
      h1Err2 += exact;
      maxErr = std::max(maxErr, exact);
      
      if (writeInLeafData)
	elInfo->getElement()->setEstimation(exact, component);
      
      if (relative) {
	for (norm_el = i = 0; i < nPoints; i++) {
	  for (norm2 = j = 0; j < dow; j++) 
	    norm2 += sqr(grdu_vec[i][j]);
	  norm_el += quadFast->getWeight(i)*norm2;
	}
	h1Norm2 += det*norm_el;
      }
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      elInfo = stack.traverseNext(elInfo);
    }
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    if (relative) {
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      double relNorm2 = h1Norm2 + 1.e-15;

      elInfo = stack.traverseFirst(fe_space->getMesh(), -1, Mesh::CALL_LEAF_EL);
      while (elInfo) {
	double exact = elInfo->getElement()->getEstimation(component) / relNorm2;
	if (writeInLeafData)
	  elinfo->getElement()->setEstimation(exact, component);
	elInfo = stack.traverseNext(elInfo);
      }
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      h1Err2 /= relNorm2;
      maxErr /= relNorm2;
    }

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    if (max)
      *max = maxErr;
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    return sqrt(h1Err2);
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  }

  template<typename T>
  double Error<T>::L2Err(const AbstractFunction<T, WorldVector<double> >& u,
			 const DOFVector<T>& uh,
			 int relErr,
			 double* max,
			 bool writeLeafData,
			 int comp)
  {
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    FUNCNAME("Error<T>::L2Err()");
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    const FiniteElemSpace *fe_space;
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    Quadrature *q = NULL;
    writeInLeafData = writeLeafData;
    component = comp;

    if (!(pU = &u)) {
      ERROR("no function u specified; doing nothing\n");
      return(0.0);
    }
    
    if (!(errUh = &uh)  ||  !(fe_space = uh.getFESpace())) {
      ERROR("no discrete function or no fe_space for it; doing nothing\n");
      return(0.0);
    }

    if (!(basFct = fe_space->getBasisFcts())) {
      ERROR("no basis functions at discrete solution ; doing nothing\n");
      return(0.0);
    }

    int dim = fe_space->getMesh()->getDim();
    int deg = u.getDegree();
    int degree = deg ? deg :  2 * fe_space->getBasisFcts()->getDegree() - 2;

    q = Quadrature::provideQuadrature(dim, degree);
    quadFast = FastQuadrature::provideFastQuadrature(basFct, *q, INIT_PHI);

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    double relative = relErr;
    double maxErr = 0.0, l2Err2 = 0.0, l2Norm2 = 0.0;
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    double *u_vec = new double[quadFast->getQuadrature()->getNumPoints()];
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    TraverseStack stack;
    ElInfo *elInfo = stack.traverseFirst(fe_space->getMesh(), -1,
					 Mesh::FILL_COORDS |
					 Mesh::CALL_LEAF_EL |
					 Mesh::FILL_DET | 
					 Mesh::FILL_GRD_LAMBDA);
    while (elInfo) {
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      elinfo = elInfo;
      const double *uh_vec;
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      quadFast->getQuadrature()->fAtQp(errU, u_vec);
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      uh_vec = errUh->getVecAtQPs(elInfo, NULL, quadFast, NULL);
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      double det = elInfo->getDet(); 
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      int nPoints = quadFast->getNumPoints();
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      double l2_err_el = 0.0, err = 0.0;

      for (int i = 0; i < nPoints; i++) {
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	err = u_vec[i] - uh_vec[i];
	l2_err_el += quadFast->getWeight(i) * sqr(err);
      }
      
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      double exact = det * l2_err_el;
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      l2Err2 += exact;
      maxErr = std::max(maxErr, exact);
      
      if (writeInLeafData)
	elInfo->getElement()->setEstimation(exact, component);
      
      if (relative) {
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	double norm_el = 0.0;
	for (int i = 0; i < nPoints; i++)
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	  norm_el += quadFast->getWeight(i) * sqr(u_vec[i]);
	l2Norm2 += det * norm_el;
      }
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      elInfo = stack.traverseNext(elInfo);
    }
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    delete [] u_vec;

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    if (relative) {
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      double relNorm2 = l2Norm2 + 1.e-15;

      elInfo = stack.traverseFirst(fe_space->getMesh(), -1, Mesh::CALL_LEAF_EL);
      while (elInfo) {
	double exact = elInfo->getElement()->getEstimation(component) / relNorm2;
	if (writeInLeafData)
	  elInfo->getElement()->setEstimation(exact, component);
	elInfo = stack.traverseNext(elInfo);
      }

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      l2Err2 /= relNorm2;
    }

    if (max)  
      *max = maxErr;

    return (sqrt(l2Err2));
  }

}