SubMatVariable.h

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
// Copyright (C) 2001-2002 Nicolas Chapados, Ichiro Takeuchi, Jean-Sebastien Senecal
// Copyright (C) 2002 Xiangdong Wang, Christian Dorion

// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 
//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
// 
//  3. The name of the authors may not be used to endorse or promote
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// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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/* *******************************************************      
   * $Id: SubMatVariable.h,v 1.6 2004/05/26 20:07:43 tihocan Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#ifndef SubMatVariable_INC
#define SubMatVariable_INC

#include "UnaryVariable.h"

namespace PLearn {
using namespace std;

class SubMatVariable: public UnaryVariable
{

private:

  typedef UnaryVariable inherited;

protected:

  int startk;
  int length_, width_;
  int i_, j_;

public:

  SubMatVariable() : startk () {}
  SubMatVariable(Variable* v, int i, int j, int the_length, int the_width);
  PLEARN_DECLARE_OBJECT(SubMatVariable);
  static void declareOptions(OptionList &ol);

  virtual void build();

  virtual void recomputeSize(int& l, int& w) const;
  virtual void fprop();
  virtual void bprop();
  virtual void bbprop();
  virtual void symbolicBprop();
  virtual void rfprop();

private:

  void build_();

};

DECLARE_OBJECT_PTR(SubMatVariable);

inline Var subMat(Var v, int i, int j, int l, int w) {
  return new SubMatVariable(v, i, j, l, w);
}

} // end of namespace PLearn

#endif 

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