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MathGroup Archive 2000

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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23755] NDSolve error message: Can't find starting value ...
  • From: Axel Kowald <axel at itb.biologie.hu-berlin.de>
  • Date: Mon, 5 Jun 2000 01:09:50 -0400 (EDT)
  • Organization: Technische Universitaet Berlin, Deutschland
  • Sender: owner-wri-mathgroup at wolfram.com

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

P.S. Btw., this is done with Mathematica 4.




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