Academic License

>> A = randn(4)

A =

    0.5377    0.3188    3.5784    0.7254
    1.8339   -1.3077    2.7694   -0.0631
   -2.2588   -0.4336   -1.3499    0.7147
    0.8622    0.3426    3.0349   -0.2050

>> eig(A)

ans =

   0.0530 + 2.3375i
   0.0530 - 2.3375i
  -1.2155 + 0.1047i
  -1.2155 - 0.1047i

>> A = [-1 2 -1;2 2 -2;-1 -2 -1]

A =

    -1     2    -1
     2     2    -2
    -1    -2    -1

>> eig(A)

ans =

   -2.0000
   -2.0000
    4.0000

>> [V,D] = eig(A)

V =

   -0.1690   -0.8971    0.4082
    0.5071    0.2760    0.8165
    0.8452   -0.3450   -0.4082


D =

   -2.0000         0         0
         0   -2.0000         0
         0         0    4.0000

>>