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MathGroup Archive 2000

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Re: NDSolve error message: Can't find starting value ...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23803] Re: [mg23755] NDSolve error message: Can't find starting value ...
  • From: "Mark Harder" <harderm at ucs.orst.edu>
  • Date: Sat, 10 Jun 2000 03:00:05 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Axel,
>P.S. Btw., this is done with Mathematica 4.
>
Then, you should look in the Help browser under 'Other Information>Warning
Messages>NDSolve>NDSolve::ndsv: ', where it says this message means that
something is wrong with your initial/boundary conditions (but not much more)
& gives 1 somewhat artificial example. Maybe someone more knowledgeable
about ODEs than I can tell you what exactly is wrong.
-mark harder

-----Original Message-----
From: Axel Kowald <axel at itb.biologie.hu-berlin.de>
To: mathgroup at smc.vnet.net
Subject: [mg23803] [mg23755] NDSolve error message: Can't find starting value ...


>Hello,
>
>I try to solve the following second order ODE with NDSolve
>
>NDSolve[{0 == R''[x] + DiracDelta[x] - R[x],         R''[-3] == 0,
>R''[3] == 0}, R, {x, -3, 3}]
>
>and I get the following error message:
>
>NDSolve::"ndsv": "Cannot find starting value for the variable x."
>
>I couldn't find any description of this message in the Mathematica book, so
I'm
>not sure what to do. I have a second order ODE with two boundary
>conditions, what's missing ?
>
>Many thanks,
>
>               Axel Kowald
>
>
>



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