CPPLapack Code

//=============================================================================
/*! _dgsmatrix+dgsmatrix operator */
inline _dgsmatrix operator+(const _dgsmatrix& matA, const dgsmatrix& matB)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] operator+(const _dgsmatrix&, const dgsmatrix&)"
            << std::endl;
#endif//CPPL_VERBOSE
  
#ifdef  CPPL_DEBUG
  if(matA.N!=matB.N || matA.M!=matB.M){
    std::cerr << "[ERROR] operator+(const _dgsmatrix&, const dgsmatrix&)"
              << std::endl
              << "These two matrises can not make a summation." << std::endl
              << "Your input was (" << matA.M << "x" << matA.N << ") + ("
              << matB.M << "x" << matB.N << ")." << std::endl;
    exit(1);
  }
#endif//CPPL_DEBUG

  dgsmatrix newmat(matA);
  
  for(long c=0; c<matB.VOL; c++){
    newmat(matB.Indx[c], matB.Jndx[c]) +=matB.Array[c];
  }
  
  return _(newmat);
}

//=============================================================================
/*! _dgsmatrix-dgsmatrix operator */
inline _dgsmatrix operator-(const _dgsmatrix& matA, const dgsmatrix& matB)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] operator-(const _dgsmatrix&, const dgsmatrix&)"
            << std::endl;
#endif//CPPL_VERBOSE
  
#ifdef  CPPL_DEBUG
  if(matA.N!=matB.N || matA.M!=matB.M){
    std::cerr << "[ERROR] operator-(const _dgsmatrix&, const dgsmatrix&)"
              << std::endl
              << "These two matrises can not make a subtraction." << std::endl
              << "Your input was (" << matA.M << "x" << matA.N << ") - ("
              << matB.M << "x" << matB.N << ")." << std::endl;
    exit(1);
  }
#endif//CPPL_DEBUG

  dgsmatrix newmat(matA);
  
  for(long c=0; c<matB.VOL; c++){
    newmat(matB.Indx[c], matB.Jndx[c]) -=matB.Array[c];
  }
  
  return _(newmat);
}

//=============================================================================
/*! _dgsmatrix*dgsmatrix operator */
inline _dgsmatrix operator*(const _dgsmatrix& matA, const dgsmatrix& matB)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] operator*(const _dgsmatrix&, const dgsmatrix&)"
            << std::endl;
#endif//CPPL_VERBOSE
  
#ifdef  CPPL_DEBUG
  if(matA.N!=matB.M){
    std::cerr << "[ERROR] operator*(const _dgsmatrix&, const dgsmatrix&)"
              << std::endl
              << "These two matrises can not make a product." << std::endl
              << "Your input was (" << matA.M << "x" << matA.N << ") * ("
              << matB.M << "x" << matB.N << ")." << std::endl;
    exit(1);
  }
#endif//CPPL_DEBUG
  
  dgsmatrix newmat( matA.M, matB.N, 0 );
  
  for(long c=0; c<matA.VOL; c++){
    long k(matA.Jndx[c]);
    std::vector< std::pair<long,long> >::iterator p;
    for(p=matB.Col[k].begin(); p!=matB.Col[k].end(); p++){
      newmat(matA.Indx[c],p->first) +=matA.Array[c]*matB.Array[p->second];
    }
  }
  
  matA.destroy();
  return _(newmat);
}