A =

     1     1     1
    -1     9     2
     0    -1     2


q =

     1
     1
     1


iterate =

  Columns 1 through 9 

    1.0000    0.3000    0.1573    0.1232    0.1147    0.1126    0.1120    0.1119    0.1118
    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000    1.0000
    1.0000    0.1000   -0.0899   -0.1362   -0.1479   -0.1509   -0.1516   -0.1518   -0.1519

  Columns 10 through 11 

    0.1118    0.1118
    1.0000    1.0000
   -0.1519   -0.1519


sigma =

  Columns 1 through 9 

         0   10.0000    8.9000    8.6629    8.6044    8.5895    8.5857    8.5848    8.5845

  Columns 10 through 11 

    8.5845    8.5844

>> eig(A)

ans =

    8.5844
    1.2207
    2.1949

>>