Choisissez un jeux de test : 
   .1 - A1.txt : matrice (3*3) symetrique
   .2 - A2.txt : matrice (3*3) de forme de Heisenberg
   .3 - A3.txt : matrice (9*9) symetrique
   .4 - Quitter sans rien faire
 Ouverture du fichier A3.txt    
Taille de la matrice :   9
 Matrice A = 
   4.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000     
  -1.0000000000000000        4.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000     
   0.0000000000000000       -1.0000000000000000        4.0000000000000000        0.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000     
  -1.0000000000000000        0.0000000000000000        0.0000000000000000        4.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000        0.0000000000000000     
   0.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        4.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000     
   0.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        4.0000000000000000        0.0000000000000000        0.0000000000000000       -1.0000000000000000     
   0.0000000000000000        0.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000        0.0000000000000000        4.0000000000000000       -1.0000000000000000        0.0000000000000000     
   0.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        4.0000000000000000       -1.0000000000000000     
   0.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000        0.0000000000000000       -1.0000000000000000        0.0000000000000000       -1.0000000000000000        4.0000000000000000     
Precision de calcul :   0.00000001
(  184 iterations)
 Valeurs propres de A : 
   6.8284271247461046     
   5.4142135623731349     
   5.4142135623730718     
   3.9999999999999893     
   3.9999999999999902     
   4.0000000000000222     
   2.5857864376269046     
   2.5857864376269162     
   1.1715728752538099