invertablemodel.h

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/***************************************************************************
 *   Copyright (C) 2005 by Robot Group Leipzig                             *
 *    martius@informatik.uni-leipzig.de                                    *
 *    fhesse@informatik.uni-leipzig.de                                     *
 *    der@informatik.uni-leipzig.de                                        *
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 *   This program is distributed in the hope that it will be useful,       *
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 *                                                                         *
 *  DESCRIPTION                                                            *
 *                                                                         *
 *   $Log: invertablemodel.h,v $
 *   Revision 1.3  2006/08/04 15:16:13  martius
 *   documentation
 *
 *   Revision 1.2  2006/07/20 17:14:34  martius
 *   removed std namespace from matrix.h
 *   storable interface
 *   abstract model and invertablemodel as superclasses for networks
 *
 *   Revision 1.1  2006/07/18 15:45:40  martius
 *   invertable models provide the linear response function (jacobian)
 *
 *                                                                 *
 ***************************************************************************/
#ifndef __INVERTABLENN_H
#define __INVERTABLENN_H

#include "matrix.h"
#include "abstractmodel.h"

/** abstract class (interface) for invertable models. 
    Invertable models provide a linear response function (jacobian)
*/
class InvertableModel : public AbstractModel {
 public: 
  virtual ~InvertableModel(){};

  /** calculates the partial derivative of the of the output with repect to the input.

      \f$J_{ij} = \frac{\partial output_i}{\partial input_j}\f$

      The result is a matrix of dimension (outputdim x inputdim)
   */
  virtual const matrix::Matrix response(const matrix::Matrix& input) const = 0;

};


#endif

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