>> A = [20 -10 0 0 0; -10 20 -10 0 0; 0 -10 15 -5 0; 0 0 -5 10 -5; 0 0 0 -5 5]

A =

    20   -10     0     0     0
   -10    20   -10     0     0
     0   -10    15    -5     0
     0     0    -5    10    -5
     0     0     0    -5     5

>> c = [-10 -10 -5 -5]

c =

   -10   -10    -5    -5

>> d = [20 20 15 10 5]

d =

    20    20    15    10     5

>> e = [-10 -10 -5 -5]

e =

   -10   -10    -5    -5

>> LUdec3(c, d, e)

ans =

   -0.5000   -0.6667   -0.6000   -0.7143

>>