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MathGroup Archive 2006

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Re: Simple question from a biologist

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67172] Re: Simple question from a biologist
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sun, 11 Jun 2006 02:18:02 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 6/10/06 at 4:53 AM, terry_najdi at hotmail.com (tnad) wrote:

>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? 

I think the problem is you have created a new variable Ax when you meant the product of A and x. That is;

In[26]:=
Solve[rate == A x,rate]/.Sol

Out[26]=
{{{rate -> (x*y*z)/(x*y + z*y + x*z)}}}

seems to be what you want
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