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change of variables

• To: mathgroup at smc.vnet.net
• Subject: [mg71241] change of variables
• From: "hussain.alqahtani at gmail.com" <hussain.alqahtani at gmail.com>
• Date: Sat, 11 Nov 2006 03:39:01 -0500 (EST)

Dear Members,

I have a differential equation that i need to nondimensionalize.
Therefore, i introduced a new nondimensional varibles and so that i get
a nondimensional equation. I am wondering how can i do that in
Mathematica?. For example if i have this term:

K*D[v,{x,2}],

my new nondimensional variables are:

x*=x/L and v*=v/L,

I can do that by hand, but since i have a huge number of equations, i
rather prefer to use Mathematica.

I appreciate any help in this regard, and many thanks in anticipation.

HMQ