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 >