Matrice_Sym.cpp

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#include <Matrice_Sym.h>
#include <TRUSTTrav.h>
#include <TRUSTTab.h>
 
int Matrice_Sym::get_est_definie() const
{
  return est_definie_;
}
 
void Matrice_Sym::set_est_definie(int val)
{
  est_definie_ = val;
}
 
void Matrice_Sym::unsymmetrize_stencil( const int nb_lines,
                                        const Stencil& symmetric_stencil,
                                        Stencil&       stencil ) const
{
 
  ArrOfInt offsets( nb_lines + 1 );
  offsets[ 0 ] = 0;
 
  const int symmetric_stencil_size = symmetric_stencil.dimension( 0 );
  for ( int k=0; k<symmetric_stencil_size; ++k )
    {
      const int line   = symmetric_stencil( k, 0 );
      const int column = symmetric_stencil( k, 1 );
      offsets[ line   + 1 ] += 1;
      offsets[ column + 1 ] += ( line == column ) ? 0 : 1 ;
    }
 
  for ( int i=0; i<nb_lines; ++i )
    {
      offsets[ i + 1 ] += offsets[ i ];
    }
 
  const int stencil_size = offsets[ nb_lines ];
  stencil.resize( stencil_size, 2 );
 
  stencil = -1;
 
  int index;
  for ( int k=0; k<symmetric_stencil_size; ++k )
    {
      const int line   = symmetric_stencil( k, 0 );
      const int column = symmetric_stencil( k, 1 );
 
 
      index = offsets[ line ];
 
      assert( stencil( index, 0 ) < 0 );
      assert( stencil( index, 1 ) < 0 );
      assert( index < offsets[ line + 1 ] );
 
      stencil( index, 0 ) = line;
      stencil( index, 1 ) = column;
 
      offsets[ line ] += 1;
 
      if ( line != column )
        {
          index = offsets[ column ];
 
          assert( stencil( index, 0 ) < 0 );
          assert( stencil( index, 1 ) < 0 );
          assert( index < offsets[ column + 1 ] );
 
          stencil( index, 0 ) = column;
          stencil( index, 1 ) = line;
 
          offsets[ column ] += 1;
        }
    }
}
 
void Matrice_Sym::unsymmetrize_stencil_and_coefficients( const int          nb_lines,
                                                         const Stencil&      symmetric_stencil,
                                                         const StencilCoeffs& symmetric_coefficients,
                                                         Stencil&            stencil,
                                                         StencilCoeffs&       coefficients ) const
{
  ArrOfInt offsets( nb_lines + 1 );
  offsets[ 0 ] = 0;
 
  const int symmetric_stencil_size = symmetric_stencil.dimension( 0 );
  assert( symmetric_stencil_size == symmetric_coefficients.size_array( ) );
  for ( int k=0; k<symmetric_stencil_size; ++k )
    {
      const int line   = symmetric_stencil( k, 0 );
      const int column = symmetric_stencil( k, 1 );
      offsets[ line   + 1 ] += 1;
      offsets[ column + 1 ] += ( line == column ) ? 0 : 1 ;
    }
 
  for ( int i=0; i<nb_lines; ++i )
    {
      offsets[ i + 1 ] += offsets[ i ];
    }
 
  const int stencil_size = offsets[ nb_lines ];
  stencil.resize( stencil_size, 2 );
  coefficients.resize_array( stencil_size );
 
  stencil = -1;
 
  int index;
  for ( int k=0; k<symmetric_stencil_size; ++k )
    {
      const int line        = symmetric_stencil( k, 0 );
      const int column      = symmetric_stencil( k, 1 );
      const double coefficient = symmetric_coefficients[ k ];
 
      index = offsets[ line ];
 
      assert( stencil( index, 0 ) < 0 );
      assert( stencil( index, 1 ) < 0 );
      assert( index < offsets[ line + 1 ] );
 
      stencil( index, 0 )   = line;
      stencil( index, 1 )   = column;
      coefficients[ index ] = coefficient;
 
      offsets[ line ] += 1;
 
      if ( line != column )
        {
          index = offsets[ column ];
 
          assert( stencil( index, 0 ) < 0 );
          assert( stencil( index, 1 ) < 0 );
          assert( index < offsets[ column + 1 ] );
 
          stencil( index, 0 )   = column;
          stencil( index, 1 )   = line;
          coefficients[ index ] = coefficient;
 
          offsets[ column ] += 1;
        }
    }
}