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MathGroup Archive 2005

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Re: question: re-organising equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55264] Re: [mg55179] question: re-organising equations
  • From: yehuda ben-shimol <bsyehuda at gmail.com>
  • Date: Thu, 17 Mar 2005 03:31:34 -0500 (EST)
  • References: <200503161035.FAA23761@smc.vnet.net>
  • Reply-to: yehuda ben-shimol <bsyehuda at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

First, note that in Mathematica notation you should use 
x==f[A,B,C,D] to define an equaltiy (unless you work with TradidionalForm)
So I will use that notation here.
you can use pattern matching
myRule = {x -> A, y -> B, z -> C, w -> D, A -> x, B -> y, C -> z, D -> w}
x==f[A,B,C,D]/.myRule
will yield
A == f[x, y, z, w]
as desired
yehuda

On Wed, 16 Mar 2005 05:35:54 -0500 (EST), OneTel
<david.hanson at student.unsw.edu.au> wrote:
> 
> 
> I have a set of simultaneous equations which are very long and so I will
> not include them here. They take the form of:
> 
>     x = f(A,B,C,D)
>     y = f(A,B,C,D)
>     z = f(A,B,C,D)
>     w = f(A,B,C,D)
> 
> I would like to re-organise these into the form:
> 
>     A = f(x,y,z,w)
>     B = f(x,y,z,w)
>     C = f(x,y,z,w)
>     D = f(x,y,z,w)
> 
> May I trouble you for some suggestions as to how this can be achieved?
> 
> Thank you,
> 
> David Hanson
> Research Postgraduate
> UNSW, Kensington 2052 NSW
> 
>


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