//génère une nouvelle génération
public void newGeneration()
{
Individu[] newPop = new Individu[_nbIndividu];
int i = 0;
Individu eliteIndividu = selectElite();
if (eliteIndividu != null)
{
Individu individu = new Individu(_nbNotes);
individu.instrument = eliteIndividu.instrument;
individu.notes = eliteIndividu.notes;
newPop[i] = individu;
i++;
}
for (; i < _nbIndividu; i++)
{
Individu individu = selection();
//si cross
if (_tauxCross > _rnd.NextDouble())
{
Individu individu2 = selection();
individu = cross(individu, individu2);
}
individu = mutation(individu);
individu.fitness = 0;
newPop[i] = individu;
}
_individus = newPop;
}
//fonction de cross-over
private Individu cross(Individu i1, Individu i2)
{
Individu newI = new Individu(_nbNotes);
int[] tabNote = new int[_nbNotes];
int nbSeq = (int)(_nbNotes * _rnd.NextDouble());
for (int i = 0; i < _nbNotes; i++)
{
if (i < nbSeq)
{
tabNote[i] = i1.notes[i];
}
else
{
tabNote[i] = i2.notes[i];
}
}
newI.notes = tabNote;
if (i1.fitness >= i2.fitness)
{
newI.instrument = i1.instrument;
}
else
{
newI.instrument = i2.instrument;
}
return(newI);
}
//fonction de cross-over
private Individu cross(Individu i1, Individu i2)
{
Individu newI = new Individu(_nbNotes);
int[] tabNote = new int[_nbNotes];
int nbSeq = (int)(_nbNotes * _rnd.NextDouble());
for (int i = 0; i < _nbNotes; i++)
{
if (i < nbSeq)
{
tabNote[i] = i1.notes[i];
}
else
{
tabNote[i] = i2.notes[i];
}
}
newI.notes = tabNote;
if(i1.fitness >= i2.fitness)
{
newI.instrument = i1.instrument;
}
else
{
newI.instrument = i2.instrument;
}
return newI;
}
//fonction de mutation
private Individu mutation(Individu i1)
{
for (int i = 0; i < _nbNotes; i++)
{
if (_rnd.NextDouble() <= _tauxMut)
{
i1.notes[i] = _rnd.Next(0, 127);
}
}
return(i1);
}
public Population()
{
_individus = new Individu[_nbIndividu];
_tauxMut = 1 / _nbNotes;
_rnd = new Random();
for (int i = 0; i < _nbIndividu; i++)
{
_individus[i] = new Individu(_nbNotes, _rnd.Next(1, 129));
_individus[i].generateRandomNotes(_rnd);
}
}
public Population()
{
_individus = new Individu[_nbIndividu];
_tauxMut = 1 / _nbNotes;
_rnd = new Random();
for(int i = 0; i < _nbIndividu; i++)
{
_individus[i] = new Individu(_nbNotes, _rnd.Next(1,129));
_individus[i].generateRandomNotes(_rnd);
}
}
//sélectionne un individu
private Individu selection()
{
int p1 = _rnd.Next(0, 10);
int p2 = _rnd.Next(0, 10);
Individu individu = new Individu(_nbNotes);
if (_individus[p1].fitness <= _individus[p2].fitness)
{
individu.notes = _individus[p2].notes;
individu.instrument = _individus[p2].instrument;
}
else
{
individu.notes = _individus[p1].notes;
individu.instrument = _individus[p1].instrument;
}
return(individu);
}
//principe de survie si la moyenne des note est >= _tauxSurvie
private Individu selectElite()
{
Individu elite = new Individu(_nbNotes);
int sFitness = 0;
for (int i = 0; i < _nbIndividu; i++)
{
sFitness = sFitness + _individus[i].fitness;
if (_individus[i].fitness > elite.fitness)
{
elite.instrument = _individus[i].instrument;
elite.notes = _individus[i].notes;
}
}
if (sFitness / _nbIndividu < _tauxSurvie)
{
elite = null;
}
return(elite);
}
//fonction de mutation
private Individu mutation(Individu i1)
{
for (int i = 0; i < _nbNotes; i++)
{
if (_rnd.NextDouble() <= _tauxMut)
{
i1.notes[i] = _rnd.Next(0,127);
}
}
return i1;
}
//principe de survie si la moyenne des note est >= _tauxSurvie
private Individu selectElite()
{
Individu elite = new Individu(_nbNotes);
int sFitness = 0;
for (int i = 0; i < _nbIndividu; i++)
{
sFitness = sFitness + _individus[i].fitness;
if(_individus[i].fitness > elite.fitness)
{
elite.instrument = _individus[i].instrument;
elite.notes = _individus[i].notes;
}
}
if(sFitness/_nbIndividu < _tauxSurvie)
{
elite = null;
}
return elite;
}
//génère une nouvelle génération
public void newGeneration()
{
Individu[] newPop = new Individu[_nbIndividu];
int i = 0;
Individu eliteIndividu = selectElite();
if (eliteIndividu != null)
{
Individu individu = new Individu(_nbNotes);
individu.instrument = eliteIndividu.instrument;
individu.notes = eliteIndividu.notes;
newPop[i] = individu;
i++;
}
for (; i < _nbIndividu; i++)
{
Individu individu = selection();
//si cross
if (_tauxCross > _rnd.NextDouble())
{
Individu individu2 = selection();
individu = cross(individu, individu2);
}
individu = mutation(individu);
individu.fitness = 0;
newPop[i] = individu;
}
_individus = newPop;
}
//sélectionne un individu
private Individu selection()
{
int p1 = _rnd.Next(0, 10);
int p2 = _rnd.Next(0, 10);
Individu individu = new Individu(_nbNotes);
if(_individus[p1].fitness <= _individus[p2].fitness)
{
individu.notes = _individus[p2].notes;
individu.instrument = _individus[p2].instrument;
}
else
{
individu.notes = _individus[p1].notes;
individu.instrument = _individus[p1].instrument;
}
return individu;
}