DenseColMajMatrixMultiplication.h

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/*
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   Copyright (c) 2009 Scientific Computing and Imaging Institute,
   University of Utah.

   
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/*
 *@file  DenseColMajMatrixMultiplication.h
 *@brief DenseColMaj matrices
 *
 *@author
 *   Steven G. Parker
 *   Department of Computer Science
 *   University of Utah
 *@date  October 1994
 *
 */

#ifndef CORE_DATATYPES_DENSECOLMAJMATRIXMULTIPLICATION_H
#define CORE_DATATYPES_DENSECOLMAJMATRIXMULTIPLICATION_H 

namespace SCIRun {

template <typename T>
void
DenseColMajMatrixGeneric<T>::mult(const ColumnMatrix& x, ColumnMatrix& b,
                           index_type beg, index_type end,
                           int spVec) const
{
  // Compute A*x=b
  ASSERTEQ(x.nrows(), this->ncols_);
  ASSERTEQ(b.nrows(), this->nrows_);
  if (beg == -1) beg = 0;
  if (end == -1) end = this->nrows_;
  index_type i, j;
  if (!spVec)
  {
    for (i=beg; i<end; i++)
    {
      double sum = 0.0;
      for (j=0; j<this->ncols_; j++)
      {
        sum += iget(i, j) * x[j];
      }
      b[i] = sum;
    }
  }
  else
  {
    for (i=beg; i<end; i++) b[i] = 0.0;
    for (j=0; j<this->ncols_; j++)
    {
      if (x[j])
      {
        for (i=beg; i<end; i++)
        {
          b[i] += iget(i, j) * x[j];
        }
      }
    }
  }
}

template <typename T>
void
DenseColMajMatrixGeneric<T>::mult_transpose(const ColumnMatrix& x, ColumnMatrix& b,
                                     index_type beg, index_type end,
                                     int spVec) const
{
  // Compute At*x=b
  ASSERT(x.nrows() == this->nrows_);
  ASSERT(b.nrows() == this->ncols_);
  if (beg == -1) beg = 0;
  if (end == -1) end = this->ncols_;
  index_type i, j;
  if (!spVec)
  {
    for (i=beg; i<end; i++)
    {
      double sum = 0.0;
      for (j=0; j<this->nrows_; j++)
      {
        sum += iget(j, i) * x[j];
      }
      b[i] = sum;
    }
  }
  else
  {
    for (i=beg; i<end; i++) b[i] = 0.0;
    for (j=0; j<this->nrows_; j++)
    {
      if (x[j])
      {
        for (i=beg; i<end; i++)
        {
          b[i] += iget(j, i) * x[j];
        }
      }
    }
  }
}

} // End namespace SCIRun

#endif