source: trunk/yat/regression/KernelTriCube.h @ 1437

#ifndef _theplu_yat_regression_kerneltricube_
#define _theplu_yat_regression_kerneltricube_

// $Id: KernelTriCube.h 1437 2008-08-25 17:55:00Z peter $

/*
  Copyright (C) 2005 Jari Häkkinen, Peter Johansson
  Copyright (C) 2006 Jari Häkkinen
  Copyright (C) 2007 Jari Häkkinen, Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/yat

  The yat library 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 2 of the
  License, or (at your option) any later version.

  The yat library 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 this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  02111-1307, USA.
*/

#include "Kernel.h"

namespace theplu {
namespace yat {
namespace regression {

  ///
  /// @brief Class for TriCubal kernel.
  ///
  class KernelTriCube : public Kernel
  {
    
  public:
    ///
    /// Constructor
    ///
    KernelTriCube() ;

    ///
    /// Operator calculating kernel value as \f$ w(x)=(1-|x|^3)^3\f$ if
    /// \f$|x|\le 1 \f$, \f$ w(x)=0 \f$ otherwise.
    ///
    double operator()(const double) const;
  
  private:
  };

}}} // of namespaces regression, yat, and theplu

#endif