Island model for PSO with modification of the velocity

git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@737 331e1502-861f-0410-8da2-ba01fb791d7f

trunk/paradiseo-peo/src/peoPSOVelocity.h

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+/* <peoPSOVelocity.h>
+*
+*  (c) OPAC Team, October 2007
+*
+* Clive Canape
+* 
+* This software is governed by the CeCILL license under French law and
+* abiding by the rules of distribution of free software.  You can  use,
+* modify and/ or redistribute the software under the terms of the CeCILL
+* license as circulated by CEA, CNRS and INRIA at the following URL
+* "http://www.cecill.info".
+*
+* As a counterpart to the access to the source code and  rights to copy,
+* modify and redistribute granted by the license, users are provided only
+* with a limited warranty  and the software's author,  the holder of the
+* economic rights,  and the successive licensors  have only  limited liability.
+*
+* In this respect, the user's attention is drawn to the risks associated
+* with loading,  using,  modifying and/or developing or reproducing the
+* software by the user in light of its specific status of free software,
+* that may mean  that it is complicated to manipulate,  and  that  also
+* therefore means  that it is reserved for developers  and  experienced
+* professionals having in-depth computer knowledge. Users are therefore
+* encouraged to load and test the software's suitability as regards their
+* requirements in conditions enabling the security of their systems and/or
+* data to be ensured and,  more generally, to use and operate it in the
+* same conditions as regards security.
+* The fact that you are presently reading this means that you have had
+* knowledge of the CeCILL license and that you accept its terms.
+*
+* ParadisEO WebSite : http://paradiseo.gforge.inria.fr
+* Contact: paradiseo-help@lists.gforge.inria.fr 
+*   Contact: clive.canape@inria.fr
+*/
+
+#ifndef _peoPSOVelocity_h
+#define _peoPSOVelocity_h
+
+
+//-----------------------------------------------------------------------------
+#include <eoPop.h>
+#include <utils/eoRNG.h>
+#include <eoFunctor.h>
+#include <eoMerge.h>
+#include <eoReduce.h>
+#include <eoReplacement.h>
+#include <utils/eoHowMany.h>
+
+template <class POT>
+class peoPSOVelocity : public eoReplacement<POT>
+{
+    public:
+    
+    	typedef typename POT::ParticleVelocityType VelocityType;
+    
+        peoPSOVelocity(	const double & _c3,
+        				eoVelocity < POT > &_velocity):
+        				c3 (_c3),
+        				velocity (_velocity){}
+
+        void operator()(eoPop<POT>& _dest, eoPop<POT>& _source)
+        {
+        	
+        	VelocityType newVelocity,r3;
+        	r3 =  (VelocityType) rng.uniform (1) * c3;
+        	for(unsigned i=0;i<_dest.size();i++)
+        		for(unsigned j=0;j<_dest[i].size();j++)
+        		{
+        			newVelocity=  _dest[i].velocities[j] + r3 * (_source[0].bestPositions[j] - _dest[i][j]);
+            		_dest[i].velocities[j]=newVelocity;
+        		}  
+        		     
+        }
+        
+    protected:
+    	const double & c3;
+    	eoVelocity < POT > & velocity;
+};
+#endif
+