/**
  * Display a listing of the resource.
  *
  * @return Response
  */
 public function index()
 {
     if (Input::has('Modality')) {
         $models = NumericalModel::where('Modality_Id', '=', Input::get('Modality'))->get();
     } else {
         $models = NumericalModel::all();
     }
     if (Request::ajax()) {
         return Response::json($models->lists('Name', 'Id'));
     }
     return View::make('numerical_models.index', compact('models'));
 }