Graphing Difference Equation

*To*: mathgroup at smc.vnet.net*Subject*: [mg91393] Graphing Difference Equation*From*: Walkman <uvnarae at hotmail.com>*Date*: Wed, 20 Aug 2008 04:03:02 -0400 (EDT)

Dear Group. I have a trouble in graphing differece equation using mathematica. For instance, I get a difference equation, y_{t} = 1.5y_{t-1} - .5y_{t-2} = 0 Since I don't know how to input the code for graphics and just want to check how the graph looks like, I input the solution instead, A(-1.2)^t + B(.5)^t where A and B constants For simplicity, I choose A = B = 1. Plot[(-1.2)^t + (.5)^t,{t,0,20}] The problem is that it doesn't work at all. If anyone who know exact way to graph difference equation, plz tell me. Thanks in advance.