private FieldODEStateAndDerivative<Decimal64> state(double t){
  return new FieldODEStateAndDerivative<>(zero.add(t),new Decimal64[0],new Decimal64[0]);
}

private FieldODEStateAndDerivative < Decimal64 > state ( double t ) { return new FieldODEStateAndDerivative < > ( zero . add ( t ) , new Decimal64 [ 0 ] , new Decimal64 [ 0 ] ) ; }
create a state at a time .
