>> A=[2 -1 0 0;-1 2 -1 0;0 -1 2 -1;0 0 -1 1]

A =

     2    -1     0     0
    -1     2    -1     0
     0    -1     2    -1
     0     0    -1     1

>> cholesky(A)

ans =

    1.4142   -0.7071         0         0
         0    1.2247   -0.8165         0
         0         0    1.1547   -0.8660
         0         0         0    0.5000

>> chol(A)

ans =

    1.4142   -0.7071         0         0
         0    1.2247   -0.8165         0
         0         0    1.1547   -0.8660
         0         0         0    0.5000

>>