AbstractLinAlgPack_COOMatrixTmplConvertToSparseCompressedColumnDef.hpp

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// Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
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#ifndef COO_MATRIX_TMPL_CONVERT_TO_SPARSE_COMPRESSED_COLUMN_DEF_H
#define COO_MATRIX_TMPL_CONVERT_TO_SPARSE_COMPRESSED_COLUMN_DEF_H

#include "AbstractLinAlgPack_COOMatrixTmplConvertToSparseCompressedColumnDecl.hpp"

namespace AbstractLinAlgPack {

template<class T_COOM>
size_type COOM_num_in_column(
    const T_COOM&           m
  , BLAS_Cpp::Transp          trans
  , size_type             col_offset
  , const IVector::value_type*    col_perm
  , size_type*            num_in_col  )
{
  if(!m.nz()) return 0;
  if( trans == BLAS_Cpp::no_trans ) {
    // non transposed
    typename T_COOM::difference_type loc_co = m.col_offset(); 
    for( typename T_COOM::const_iterator itr = m.begin(); itr != m.end(); ++itr )
      num_in_col[ col_perm[ col_offset + loc_co + itr->col_j()  -1 ]  -1 ]++;
  }
  else {
    // transposed
    typename T_COOM::difference_type loc_ro = m.row_offset(); 
    for( typename T_COOM::const_iterator itr = m.begin(); itr != m.end(); ++itr ) {
      const size_type i = itr->row_i();
      num_in_col[ col_perm[ col_offset + loc_ro + i - 1 ]  - 1 ]++;
    }
  }
  return m.nz();
}

template<class T_COOM>
void COOM_insert_nonzeros(
    const T_COOM&           m
  , BLAS_Cpp::Transp          trans
  , value_type            alpha
  , size_type             row_offset
  , size_type             col_offset
  , const IVector::value_type*    row_perm
  , const IVector::value_type*    col_perm
  , size_type*            next_nz_in_col
  , FortranTypes::f_dbl_prec*     D_val
  , FortranTypes::f_int*        D_row_i     )
{
  if(!m.nz()) return;
  typename T_COOM::difference_type
    loc_ro = m.row_offset(),
    loc_co = m.col_offset();
  if( trans == BLAS_Cpp::no_trans ) {
    // non transposed
    for( typename T_COOM::const_iterator itr = m.begin(); itr != m.end(); ++itr ) {
      const size_type
        i = loc_ro + itr->row_i(),
        j = loc_co + itr->col_j();
      const size_type
        ele = next_nz_in_col[ col_perm[ col_offset + j - 1 ] - 1 ]++;
      D_val[ ele - 1 ] = alpha * itr->value();
      if(D_row_i)
        D_row_i[ ele - 1 ] = row_perm[ row_offset + i - 1 ];
    }
  }
  else {
    // transposed
    for( typename T_COOM::const_iterator itr = m.begin(); itr != m.end(); ++itr ) {
      const size_type
        i = loc_co + itr->col_j(),
        j = loc_ro + itr->row_i();
      const size_type
        ele = next_nz_in_col[ col_perm[ col_offset + j - 1 ] - 1 ]++;
      D_val[ ele - 1 ] = alpha * itr->value();
      if(D_row_i)
        D_row_i[ ele - 1 ] = row_perm[ row_offset + i - 1 ];
    }
  }
}

template<class T_COOM>
value_type COOM_insert_scaled_nonzeros(
    const T_COOM&           m
  , BLAS_Cpp::Transp          trans
  , value_type            scaled_max_ele
  , size_type             row_offset
  , size_type             col_offset
  , const IVector::value_type*    row_perm
  , const IVector::value_type*    col_perm
  , size_type*            next_nz_in_col
  , FortranTypes::f_dbl_prec*     D_val
  , FortranTypes::f_int*        D_row_i     )
{
  value_type alpha = 0;
  for( typename T_COOM::const_iterator itr = m.begin(); itr != m.end(); ++itr ) {
    register const value_type val = ::fabs( itr->value() );
    if( val > alpha ) alpha = val;
  }
  // scaled_max_ele = max|alpha*A| = alpha * max|A| 
  alpha = scaled_max_ele / alpha;
  COOM_insert_nonzeros( m, trans, alpha, row_offset
    , col_offset, row_perm, col_perm, next_nz_in_col, D_val, D_row_i );
  return alpha;
}

} // end namespace AbstractLinAlgPack

#endif  // COO_MATRIX_TMPL_CONVERT_TO_SPARSE_COMPRESSED_COLUMN_DEF_H

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