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MathGroup Archive 2000

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Re: Question: nonlinear differential equation with boundary conditions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26466] Re: Question: nonlinear differential equation with boundary conditions
  • From: "Kevin J. McCann" <Kevin.McCann at jhuapl.edu>
  • Date: Thu, 21 Dec 2000 22:46:49 -0500 (EST)
  • Organization: Johns Hopkins University Applied Physics Lab, Laurel, MD, USA
  • References: <91pjgd$5vc@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

If you would send me the actual DE, I could attempt a shooting method, or I
could send you a notebook on solutions to some quantum wavefunctions with
2-point boundary conditions.

Kevin

Kevin J. McCann
Johns Hopkins University APL
Johns Hopkins Road
Laurel MD 20723


Ronald Sastrawan <sastra at fmf.uni-freiburg.de> wrote in message
news:91pjgd$5vc at smc.vnet.net...
> Hello!
> Sorry, in my last post there was a mistake in my equation.
> (There should be a y^2 in the equation). The real question was:
>
> I encountered a problem, trying to numerically solve a differential
> equation.
> My equation looks like:
>
> A y''[x] - B (y[x])^2 + C Exp[-Dx] == 0
> with boundary conditions: y'[0]==0 , y'[E]==0
>
> All constants A to E are known.
>
> Mathematica complains, that the equation is not linear. But in the
> online documentation I saw many examples of nonlinear differential
> equations, which all work fine. What is the difference between the
> examples and my equation ? And is there a possibility to NDSolve my
> equation ?
>
> Any hint on this would be of great help to me.
>
> Thanks a lot,
>
> Ronald
>
> --
> Ronald Sastrawan
>
> Freiburg Materials Research Center
> Stefan-Meier-Str. 21
> D-79104 Freiburg
> Germany
> Tel: ++49/761/203-4802
> FAX: ++49/761/203-4801
> EMAIL: sastra at fmf.uni-freiburg.de
> http://www.fmf.uni-freiburg.de/~biomed/FSZ/forschung-FSZ.html
>
>
>




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