       Re: question: re-organising equations

• To: mathgroup at smc.vnet.net
• Subject: [mg55229] Re: [mg55179] question: re-organising equations
• From: DrBob <drbob at bigfoot.com>
• Date: Thu, 17 Mar 2005 03:29:00 -0500 (EST)
• References: <200503161035.FAA23761@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```> May I trouble you for some suggestions as to how this
> can be achieved?

If the equations are badly non-linear, it probably can't. If it can be done at all, methods will depend on the function f; details are everything.

You can try this, however:

Solve[x == f[a,b,c,d],{a,b,c,d}]

There are also other options such as Reduce, SolveAlways, and FindInstance.

Once you've solved for x, of course y == z == w == x.

Bobby

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
> UNSW, Kensington 2052 NSW
>
>
>
>

--
DrBob at bigfoot.com

```

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