       Re: Simple question from a biologist

• To: mathgroup at smc.vnet.net
• Subject: [mg67151] Re: Simple question from a biologist
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sun, 11 Jun 2006 02:16:57 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <e6e27d\$1tp\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```tnad wrote:
> I'm a bit new to this so please bear with me. I solved this eqation:
>
> Sol = Solve[{{{-x, 0, z}, {x, -y, 0}, {0, y, -z}}.{A, B, C} == 0, A + B + C == 1}, {A, B, C}]
>
> and got the ouputs of A, B and C interms of x,y, and z each.
>
> Now I want to express a term called "rate" where rate = Ax = By = Cz in terms of x, y and Z only.
>
> So I tried to do this:
> Solve[rate == Ax , rate] /. Sol
>
> but I cannot get the rate in terms of x,y and z.
> Is there a better way to do this? Also if someone knows of a better tuttorial (better than the built-in tuttorial) for mathematica, please let me know.
>
Do you mean something like Out?

In:=
sol = Solve[{{{-x, 0, z}, {x, -y, 0}, {0, y, -z}} . {A, B, C} == 0,
A + B + C == 1}, {A, B, C}]

Out=
y z                   x z
{{A -> ---------------, B -> ---------------,
x y + x z + y z       x y + x z + y z

x y
C -> ---------------}}
x y + x z + y z

In:=
Solve[rate == A*x, rate] /. sol[]

Out=
x y z
{{rate -> ---------------}}
x y + x z + y z

HTH,
Jean-Marc

```

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