public int addSecondaryEquations(final SecondaryODE secondary){
  components.add(secondary);
  mapper=new EquationsMapper(mapper,secondary.getDimension());
  return components.size();
}

public int addSecondaryEquations ( final SecondaryODE secondary ) { components . add ( secondary ) ; mapper = new EquationsMapper ( mapper , secondary . getDimension ( ) ) ; return components . size ( ) ; }
add a set of secondary equations to be integrated along with the primary set .
