AbstractLinAlgPack_MatrixExtractSparseElements.cpp

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// 
// Moocho: Multi-functional Object-Oriented arCHitecture for Optimization
//                  Copyright (2003) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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#include <assert.h>

#include "AbstractLinAlgPack_MatrixExtractSparseElements.hpp"

namespace AbstractLinAlgPack {

// Overridden from MatrixConvertToSparseFortranCompatible

index_type
MatrixExtractSparseElements::num_nonzeros(
  EExtractRegion        extract_region
  ,EElementUniqueness   element_uniqueness
  ) const
{
  index_type dl,du;
  get_dl_du(extract_region,&dl,&du);
  return count_nonzeros(
    element_uniqueness,NULL,NULL,Range1D(1,rows()),Range1D(1,cols()),dl,du);
}

void MatrixExtractSparseElements::coor_extract_nonzeros(
  EExtractRegion                extract_region
  ,EElementUniqueness           element_uniqueness
  ,const index_type             len_Aval
  ,value_type                   Aval[]
  ,const index_type             len_Aij
  ,index_type                   Arow[]
  ,index_type                   Acol[]
  ,const index_type             row_offset
  ,const index_type             col_offset
   ) const
{
  index_type dl,du;
  get_dl_du(extract_region, &dl, &du);
  coor_extract_nonzeros(
    element_uniqueness
    ,NULL,NULL,Range1D(1,rows()),Range1D(1,cols()),dl,du
    ,1.0
    ,len_Aval,Aval,len_Aij,Arow,Acol,row_offset,col_offset);
}

// private

void MatrixExtractSparseElements::get_dl_du(
  EExtractRegion extract_region, index_type* dl, index_type* du
  ) const
{
  const size_type
    rows = this->rows(),
    cols = this->cols();
  switch(extract_region) {
    case EXTRACT_FULL_MATRIX:
      *dl = -(rows-1);
      *du = +(cols-1);
      break;
    case EXTRACT_UPPER_TRIANGULAR:
      *dl = 0;
      *du = +(cols-1);
      break;
    case EXTRACT_LOWER_TRIANGULAR:
      *dl = -(rows-1);
      *du = 0;
      break;
    default:
      TEST_FOR_EXCEPT(true);
      break;
  }
}


} // end namespace AbstractLinAlgPack