ConcatRowsSubVMatrix.h

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// -*- C++ -*-

// PLearn (A C++ Machine Learning Library)
// Copyright (C) 1998 Pascal Vincent
// Copyright (C) 1999-2001 Pascal Vincent, Yoshua Bengio, Rejean Ducharme and University of Montreal
// Copyright (C) 2002 Pascal Vincent, Julien Keable, Xavier Saint-Mleux
//
// 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
//     products derived from this software without specific prior written
//     permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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// This file is part of the PLearn library. For more information on the PLearn
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/* *******************************************************      
   * $Id: ConcatRowsSubVMatrix.h,v 1.4 2004/04/05 22:49:56 morinf Exp $
   ******************************************************* */


#ifndef ConcatRowsSubVMatrix_INC
#define ConcatRowsSubVMatrix_INC

#include "VMat.h"

namespace PLearn {
using namespace std;
 

class ConcatRowsSubVMatrix: public VMatrix
{
    typedef VMatrix inherited;

 protected:
    VMat distr;
    TVec<int> start;
    TVec<int> len;

    void check(); 

    void getpositions(int i, int& whichvm, int& rowofvm) const; 

  public:
    // ******************
    // *  Constructors  *
    // ******************
    ConcatRowsSubVMatrix(); 

    ConcatRowsSubVMatrix(VMat the_distr, TVec<int>& the_start, TVec<int>& the_len);
    ConcatRowsSubVMatrix(VMat the_distr, int start1, int len1, int start2, int len2);

    PLEARN_DECLARE_OBJECT(ConcatRowsSubVMatrix);
    static void declareOptions(OptionList &ol);

    virtual void build();

    virtual real get(int i, int j) const;
    virtual void getSubRow(int i, int j, Vec v) const;
    virtual void reset_dimensions() 
    { 
      distr->reset_dimensions();
      width_=distr->width();
      length_=0;
      for (int i=0;i<len.length();i++) 
        length_ += len[i];
    }
    virtual real dot(int i1, int i2, int inputsize) const;
    virtual real dot(int i, const Vec& v) const;
private:
    void build_();
};

DECLARE_OBJECT_PTR(ConcatRowsSubVMatrix);

} // end of namespcae PLearn
#endif

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