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MathGroup Archive 1999

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Re: System of equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18365] Re: System of equations
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 30 Jun 1999 14:13:29 -0400
  • Organization: Universitaet Leipzig
  • References: <7l0lon$cun@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

f'[x]==g[x]*h[x]

f[x]==g[x]*h[x]

gives 
f'[x]==f[x]

and f[x]-> Exp[x]

h[x]==2 x gives

h[x]-> x^2


and for what do you need Mathematica ?

Regards
  Jens

Alexander Sirotkin wrote:
> 
> I need to solve a system of equations, some of which are
> regular differential equations and some not (something
> like f'(x) = g(x)*h(x), h'(x) = 2x and f(x) = h(x)*g(x)
> but more complex so that I can't just replace f(x) with
> h(x)*g(x)).
> 
> NDSolve refuses to work with some weird error messages...
> 
> Is there any way to solve such kind of system ?
> 
> P.S. .nb file with mathematica source is in my previous posting...


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