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MathGroup Archive 2001

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Re: Simultaneous difference equation

  • To: mathgroup at
  • Subject: [mg30613] Re: [mg30600] Simultaneous difference equation
  • From: Tomas Garza <tgarza01 at>
  • Date: Fri, 31 Aug 2001 04:09:38 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

Your problem is discussed in the Help|Add-ons|Standard
Packages|DiscreteMath|RSolve. As a novice user you are probably unaware that
the underscore "_" (called "Blank") has a specific meaning in Mathematica:
it is a pattern object that can stand for any expression. So you must start
by rewriting your coefficients and throw out all the blanks therein.

Tomas Garza
Mexico City
----- Original Message -----
From: "Shusaku Yamamoto" <shusaku.yamamoto at>
To: mathgroup at
Subject: [mg30613] [mg30600] Simultaneous difference equation

> Hello, I have just started using (or more appropriately trying to use)
> Mathematica. As you expect, I have a problem. I would like to know
> Mathematica code for solving simultaneous difference eqation; for
> example:
> a_11*x(t)+a_12*y(t)=a_13*x(t-1)+a_14*y(t-1)+k_1
> a_21* x(t)+a_22*y(t)=a_23*x(t-1)+a_24*y(t-1)+k_2
> Or, in matrix notation,
> A_1*Y(t)=A_2*Y(t-1)+K
> t denotes time t, and t-1 is one period before time t.
> I have go through help menu in Mathematica. Yet, I could not get reached
> to the topic of difference equation. If you know the code (or what to be
> typed), could you reply this message?
> Thank you very much in advance.

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