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MathGroup Archive 2005

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Re: NDSolve. SolveDelayed->True

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57028] Re: NDSolve. SolveDelayed->True
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 12 May 2005 03:53:08 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <d5uv4p$983$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

insert the scaline explicit in your equations and 
solve the system
for the mass of the chemicals and not for the 
concentrations.
Regards
  Jens

"Chris Fernando" <ctf20 at sussex.ac.uk> schrieb im 
Newsbeitrag news:d5uv4p$983$1 at smc.vnet.net...
>I am simulating a simple cell containing 
>chemicals. I have a set of kinetic equations for 
>each chemical in the cell. However, the cell 
>grows at a certain rate, and this changes the 
>concentration of the chemicals in it. This means 
>I have to scale the concentrations of chemicals 
>at each timestep of the numerical simulation, 
>according to the factor [(S(t)/S(t+1)]^(3/2). 
>When I was using Eular integration in a C program 
>this was easy. I just did it every timestep. But 
>with NDSolve, how can I scale all the equations 
>for substrate concentration appropriately.
>
> In general terms, how do I deal with having to 
> scale the r.h.s. of a set of differential 
> equations on the basis of the function above, 
> where S'[t] is also a differential equation that 
> is being solved in that system!!??
>
> Yours
> Chrisantha
> 



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