Method commitChange

src/basis_factorization/CSRMatrix.cpp:545–579

}

void CSRMatrix::commitChange( unsigned row, unsigned column, double newValue )
{
    ASSERT( FloatUtils::wellFormed( newValue ) );

    // First check whether the entry already exists
    unsigned index = findArrayIndexForEntry( row, column );
    bool found = ( index < _nnz );

    if ( !found )
    {
        // Entry doesn't exist currently
        if ( !FloatUtils::isZero( newValue ) )
        {
            CommittedChange change;
            change._column = column;
            change._value = newValue;
            _committedInsertions[row].insert( change );
        }
    }
    else
    {
        // Entry currently exists
        if ( FloatUtils::isZero( newValue ) )
        {
            _committedDeletions.insert( index );
        }
        else if ( FloatUtils::areDisequal( newValue, _A[index] ) )
        {
            CommittedChange change;
            change._column = column;
            change._value = newValue;
            _committedChanges[row].append( change );
        }
    }
}

unsigned CSRMatrix::findArrayIndexForEntry( unsigned row, unsigned column ) const
{