(* Linear Algebra: Theory and Applications *)
(* Ward Cheney & David Kincaid *)
(* JBPub.com (c) 2008 *) 
(* File: exp831.mat *)
(* Example 8.3.1 *)

G = {{0.0,0.3,0.2},{0.3,0.0,0.1},{0.2,0.1,0.0}};
b = {7.0;5.0;3.0};
x = {0.0,0.0,0.0};
For[k=1, k<<=50, k++
  x = G.x + b
]