CPPLapack Code

//=============================================================================
/*! _dgematrix*dssmatrix operator */
inline _dgematrix operator*(const _dgematrix& matA, const dssmatrix& matB)
{
#ifdef  CPPL_VERBOSE
  std::cerr << "# [MARK] operator*(const _dgematrix&, const dssmatrix&)" << std::endl;
#endif//CPPL_VERBOSE
  
#ifdef  CPPL_DEBUG
  if(matA.N!=matB.m){
    std::cerr << "[ERROR] operator*(const _dgematrix&, const dssmatrix&)" << 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
  
  dgematrix newmat(matA.M, matB.N);
  newmat.zero();
  
  double *ap(matB.array);
  long *kp(matB.indx), *jp(matB.jndx), c(0);
  while(c<matB.vol){
    for(long i=0; i<matA.M; i++){
      newmat(i,*jp) +=matA(i,*kp)*(*ap);
    }
    if((*kp)!=(*jp)){
      for(long i=0; i<matA.M; i++){
        newmat(i,*kp) +=matA(i,*jp)*(*ap);
      }
    }
    ap++; kp++; jp++; c++;
  }
  
  matA.destroy();
  return _(newmat);
}