text: //
  //  YCProblem.h
  //  YCML
  //
  //  Created by Ioannis (Yannis) Chatzikonstantinou on 19/3/15.
  //  Copyright (c) 2015 Ioannis (Yannis) Chatzikonstantinou. All rights reserved.
  //
  // This file is part of YCML.
  //
  // YCML is free software: you can redistribute it and/or modify
  // it under the terms of the GNU General Public License as published by
  // the Free Software Foundation, either version 3 of the License, or
  // (at your option) any later version.
  //
  // YCML is distributed in the hope that it will be useful,
  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  // GNU General Public License for more details.
  //
  // You should have received a copy of the GNU General Public License
  // along with YCML.  If not, see <http://www.gnu.org/licenses/>.
  
  @import Foundation;
  #import "YCProblem.h"
  
  @protocol YCDerivativeProblem <YCProblem>
  
  - (void)derivatives:(Matrix *)target parameters:(Matrix *)parameters;
  
  @end
  