@Override public double value(int attIndex){
  int index=locateIndex(attIndex);
  if ((index >= 0) && (m_Indices[index] == attIndex)) {
    return m_AttValues[index];
  }
 else {
    return 0.0;
  }
}

@ Override public double value ( int attIndex ) { int index = locateIndex ( attIndex ) ; if ( ( index >= 0 ) && ( m_Indices [ index ] == attIndex ) ) { return m_AttValues [ index ] ; } else { return 0.0 ; } }
returns an instance ' s attribute value in internal format .
