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MathGroup Archive 2003

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Re: partial differential

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44797] Re: partial differential
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 27 Nov 2003 11:38:21 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <bpurea$o9r$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

without \[Alpha], diff,nstart .. and the other
constants we can not
tell you what's wrong. At least an error
message would help.

Regards
  Jens

Uli Wuerfel wrote:
> 
> Hi experts,
> I have problems with solving stuff like
> 
>          \!\(pd = \[PartialD]\_t\
>          n[x, t] == \(-dif\)\ \[PartialD]\_\(x, x\)\ n[x, t] +
>          int\ Exp[\(-\[Alpha]\)\ x] - rek\ n[x, t]\)
> 
> ( where dif, int, alpha and rek are constants )
> 
> I tried it via
> 
>         \!\(lsg =
>      NDSolve[{pd, n[x, 0] == nstart,
>          n[0, t] == nstart, \((\[PartialD]\_x\ n[x, t] /. x ->
> thickn)\)                       == 0},
>        n, {x, 0, thickn}, {t, 0, 2}]\)
> 
> ( again nstart and thickn are constants )
> 
> but could not make it...
> 
> Have any advice??
> Thank you,
> Uli


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