AnasaziStatusTestResNorm.hpp

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//                 Anasazi: Block Eigensolvers Package
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#ifndef ANASAZI_STATUS_TEST_RESNORM_HPP
#define ANASAZI_STATUS_TEST_RESNORM_HPP

#include "AnasaziStatusTest.hpp"
#include "Teuchos_ScalarTraits.hpp"

namespace Anasazi {


template <class ScalarType, class MV, class OP>
class StatusTestResNorm : public StatusTest<ScalarType,MV,OP> {

  typedef typename Teuchos::ScalarTraits<ScalarType>::magnitudeType MagnitudeType;

 public:



  enum ResType {
    RES_ORTH,
    RES_2NORM,
    RITZRES_2NORM
  };




  StatusTestResNorm(MagnitudeType tol, int quorum = -1, ResType whichNorm = RES_ORTH, bool scaled = true);

  virtual ~StatusTestResNorm() {};



  TestStatus checkStatus( Eigensolver<ScalarType,MV,OP>* solver );

  TestStatus getStatus() const { return state_; }



  void setQuorum(int quorum) {
    state_ = Undefined;
    quorum_ = quorum;
  }

  int getQuorum() {
    return quorum_;
  }

  void setTolerance(MagnitudeType tol) {
    state_ = Undefined;
    tol_ = tol;
  }

  MagnitudeType getTolerance() {return tol_;}

  void setWhichNorm(ResType whichNorm) {
    state_ = Undefined;
    whichNorm_ = whichNorm;
  }

  ResType getWhichNorm() {return whichNorm_;}

  void setScale(bool relscale) {
    state_ = Undefined;
    scaled_ = relscale;
  }

  bool getScale() {return scaled_;}

  std::vector<int> whichVecs() {
    return ind_;
  }

  int howMany() {
    return ind_.size();
  }





  void reset() { 
    state_ = Undefined;
  }


  void clearStatus() {
    state_ = Undefined;
  }



  
  ostream& print(ostream& os, int indent = 0) const;
 
  private:
    TestStatus state_;
    MagnitudeType tol_;
    std::vector<int> ind_;
    int quorum_;
    bool scaled_;
    ResType whichNorm_;
};


template <class ScalarType, class MV, class OP>
StatusTestResNorm<ScalarType,MV,OP>::StatusTestResNorm(MagnitudeType tol, int quorum, ResType whichNorm, bool scaled)
  : state_(Undefined), tol_(tol), quorum_(quorum), scaled_(scaled), whichNorm_(whichNorm) {}

template <class ScalarType, class MV, class OP>
TestStatus StatusTestResNorm<ScalarType,MV,OP>::checkStatus( Eigensolver<ScalarType,MV,OP>* solver ) {
  typedef Teuchos::ScalarTraits<MagnitudeType> MT;
  
  std::vector<MagnitudeType> res;

  // get the eigenvector/ritz residuals norms (using the appropriate norm)
  // get the eigenvalues/ritzvalues and ritz index as well
  std::vector<Value<ScalarType> > vals = solver->getRitzValues();
  switch (whichNorm_) {
    case RES_2NORM:
      res = solver->getRes2Norms();
      // we want only the ritz values corresponding to our eigenvector residuals
      vals.resize(res.size());
      break;
    case RES_ORTH:
      res = solver->getResNorms();
      // we want only the ritz values corresponding to our eigenvector residuals
      vals.resize(res.size());
      break;
    case RITZRES_2NORM:
      res = solver->getRitzRes2Norms();
      break;
  }

  // if appropriate, scale the norms by the magnitude of the eigenvalue estimate
  if (scaled_) {
    Teuchos::LAPACK<int,MagnitudeType> lapack;

    for (unsigned int i=0; i<res.size(); i++) {
      MagnitudeType tmp = lapack.LAPY2(vals[i].realpart,vals[i].imagpart);
      // scale by the newly computed magnitude of the ritz values
      if ( tmp != MT::zero() ) {
        res[i] /= tmp;
      }
    }
  }

  // test the norms
  int have = 0;
  ind_.resize(res.size());
  for (unsigned int i=0; i<res.size(); i++) {
    TEST_FOR_EXCEPTION( MT::isnaninf(res[i]), StatusTestError, "StatusTestResNorm::checkStatus(): residual norm is nan or inf" );
    if (res[i] < tol_) {
      ind_[have] = i;
      have++;
    }
  }
  ind_.resize(have);
  int need = (quorum_ == -1) ? res.size() : quorum_;
  state_ = (have >= need) ? Passed : Failed;
  return state_;
}


template <class ScalarType, class MV, class OP>
ostream& StatusTestResNorm<ScalarType,MV,OP>::print(ostream& os, int indent) const {
  string ind(indent,' ');
  os << ind << "- StatusTestResNorm: ";
  switch (state_) {
  case Passed:
    os << "Passed" << endl;
    break;
  case Failed:
    os << "Failed" << endl;
    break;
  case Undefined:
    os << "Undefined" << endl;
    break;
  }
  os << ind << "  (Tolerance,WhichNorm,Scaled,Quorum): " 
            << "(" << tol_;
  switch (whichNorm_) {
  case RES_ORTH:
    os << ",RES_ORTH";
    break;
  case RES_2NORM:
    os << ",RES_2NORM";
    break;
  case RITZRES_2NORM:
    os << ",RITZRES_2NORM";
    break;
  }
  os        << "," << (scaled_   ? "true" : "false")
            << "," << quorum_ 
            << ")" << endl;

  if (state_ != Undefined) {
    os << ind << "  Which vectors: ";
    if (ind_.size() > 0) {
      for (unsigned int i=0; i<ind_.size(); i++) os << ind_[i] << " ";
      os << endl;
    }
    else {
      os << "[empty]" << endl;
    }
  }
  return os;
}


} // end of Anasazi namespace

#endif /* ANASAZI_STATUS_TEST_RESNORM_HPP */

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