# eoDistance.h

    00001 // -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
    00002
    00003 //-----------------------------------------------------------------------------
    00004 // eoDistance.h
    00005 // (c) GeNeura Team, 1998, Marc Schoenauer 2001
    00006 /*
    00007     This library is free software; you can redistribute it and/or
    00008     modify it under the terms of the GNU Lesser General Public
    00009     License as published by the Free Software Foundation; either
    00010     version 2 of the License, or (at your option) any later version.
    00011
    00012     This library is distributed in the hope that it will be useful,
    00013     but WITHOUT ANY WARRANTY; without even the implied warranty of
    00014     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00015     Lesser General Public License for more details.
    00016
    00017     You should have received a copy of the GNU Lesser General Public
    00018     License along with this library; if not, write to the Free Software
    00019     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00020
    00021     Contact: todos@geneura.ugr.es, http://geneura.ugr.es
    00022              Marc.Schoenauer@polytechnique.fr
    00023  */
    00024 //-----------------------------------------------------------------------------
    00025
    00026 #ifndef _eoDistance_H
    00027 #define _eoDistance_H
    00028
    00029 #include <eoFunctor.h>
    00034 template< class EOT >
    00035 class eoDistance : public eoBF<const EOT &, const EOT &, double>
    00036 {};
    00037
    00038
    00043 template< class EOT >
    00044 class eoQuadDistance : public eoDistance<EOT>
    00045 {
    00046 public:
    00047   double operator()(const EOT & _v1, const EOT & _v2)
    00048   {
    00049      double sum=0.0;
    00050     for (unsigned i=0; i<_v1.size(); i++)
    00051       {
    00052         double r = static_cast<double> (_v1[i]) - static_cast<double> (_v2[i]);
    00053         sum += r*r;
    00054       }
    00055     return sqrt(sum);
    00056   }
    00057 };
    00058
    00065 template< class EOT >
    00066 class eoHammingDistance : public eoDistance<EOT>
    00067 {
    00068 public:
    00069   double operator()(const EOT & _v1, const EOT & _v2)
    00070   {
    00071      double sum=0.0;
    00072     for (unsigned i=0; i<_v1.size(); i++)
    00073       {
    00074         double r = static_cast<double> (_v1[i]) - static_cast<double> (_v2[i]);
    00075         sum += fabs(r);
    00076       }
    00077     return sum;
    00078   }
    00079 };
    00080
    00081 /* this distance measures the difference in fitness
    00082  * I am not sure it can be of any use, though ...
    00083  * except for some testing
    00084  */
    00085 template< class EOT >
    00086 class eoFitnessDistance : public eoDistance<EOT>
    00087 {
    00088 public:
    00089   double operator()(const EOT & _v1, const EOT & _v2)
    00090   {
    00091     double d = _v1.fitness() - _v2.fitness();
    00092     return sqrt(d*d);
    00093   }
    00094 };
    00095
    00096
    00097
    00098 #endif