Created
March 5, 2015 11:13
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Methode PageRank
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public Matrice pageRank() { | |
// 0. Virer si pas carré | |
if (!this.carree()) | |
throw new MathException("Pas carrée"); | |
// 1. vérification matrice avec que des 0 et des 1 | |
for (int i = 0 ; i < nbLignes ; i++) { | |
for (int j= 0 ; j < nbColonnes ; j++) { | |
if (data[i][j] != 0.0 && data[i][j] != 1.0 ) | |
throw new MathException("Pas que des 0 et des 1"); | |
} | |
} | |
// 2. Creer matrice transistion (sans oublier trous noir) | |
Matrice transistion = new Matrice(this); | |
Matrice trousNoirs = new Matrice(transistion.nbLignes,transistion.nbColonnes); | |
for (int i = 0 ; i < transistion.nbColonnes; i++) { | |
double sommeColonne = 0; | |
for (int j= 0 ; j < transistion.nbLignes ; j++) { | |
sommeColonne += transistion.data[j][i]; | |
trousNoirs.data[j][i] = 1.0/nbLignes; | |
} | |
if (sommeColonne == 0){ | |
for (int k = 0 ; k < transistion.nbColonnes ; k++) { | |
transistion.data[k][i] = 1.0/nbLignes; | |
} | |
} else { | |
for (int k = 0 ; k < transistion.nbColonnes ; k++) { | |
transistion.data[k][i] /= sommeColonne; | |
} | |
} | |
} | |
// 3. Créer matrice google | |
Matrice google = transistion.produitParScalaire(0.85).somme(trousNoirs.produitParScalaire(0.15)); | |
// 4. Association matrice initial v0 | |
Matrice v0 = new Matrice(nbColonnes,1); | |
v0.data[0][0] = 1; | |
// 5. Calculer état stable | |
for (int i= 0 ; i <= 85 ; i++){ | |
Matrice temporaire = google.produitAGauche(v0); | |
// normaliser matrice | |
double sommeColonne = 0; | |
for (int j = 0 ; j < temporaire.nbLignes ; j++) { | |
sommeColonne += temporaire.data[j][0]; | |
} | |
if (sommeColonne != 0.0) { | |
for (int j = 0 ; j < temporaire.nbLignes ; j++) { | |
temporaire.data[j][0] = temporaire.data[j][0] / sommeColonne; | |
} | |
} | |
v0 = temporaire; | |
} | |
return v0; | |
} |
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