Untitled

Note: A is equivalent to your aa matrix; K is equivalent to your kk matrix

A = (remains same in all iterations for same N)

    2.0000   -0.5000         0         0
   -0.5000    2.0000   -0.5000         0
         0   -0.5000    2.0000   -0.5000
         0         0   -0.5000    2.0000
--------------------------------------------------------

K = (after 5 iterations)

    0.1376
    0.2996
    0.4988
    1.2378

K = (after 4 iterations)

    0.1094
    0.2507
    0.4525
    1.2069

K = (after 3 iterations)

    0.0658
    0.1868
    0.3752
    1.1656

K = (after 2 iterations)

    0.0191
    0.0766
    0.2871
    1.0718

K = (after 1 iteration)

         0
         0
         0
    1.0000
------------------------------------------------------

        V       Y
      0.0000        0.0000
      0.1477        0.2000
      0.3155        0.4000
      0.5152        0.6000
      0.7477        0.8000
      1.0000        1.0000

Computation Time
 5.8586e+000s