DSolve to solve simultaneous ODEs
- To: mathgroup at smc.vnet.net
- Subject: [mg9443] DSolve to solve simultaneous ODEs
- From: "Kelvin Yip" <ykelvin at unixg.ubc.ca>
- Date: Wed, 5 Nov 1997 01:57:00 -0500
- Organization: The University of British Columbia
- Sender: owner-wri-mathgroup at wolfram.com
Hi Everyone,
Although I follow closely the Mathematica book's instruction , I still
only receive a out put which is just a parapharse of my input. The
Program (Version 2.2) work well on solving single equation but not a
systems of ODEs, anyone can help ?
DSolve[(u*x[t]*(1-x[t]/xmax)-x'[t]==0),x[t],t]
t u
E
{{x[t] -> -----------}, {x[t] -> 0}}
t u
E
---- + C[1]
xmax
This one is OK but not the one below!
DSolve[{(u*x[t]*(1-x[t]/m)-x'[t]==0),
(n*x[t]-p'[t]==0),(-p'[t]/Yp-x'[t]/Yx-s'[t]==0)},{x,p,s},t]
x[t]
DSolve[{u x[t] (1 - ----) - x'[t] == 0, n x[t] - p'[t] == 0,
m
p'[t] x'[t]
-(-----) - s'[t] - ----- == 0}, {x, p, s}, t]
Yp Yx
I have tried to load the DSolve package first then type my equation in,
still no success.
Thank you for your attention!
Kelvin Yip