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Re: ODE problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98598] Re: ODE problem
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Mon, 13 Apr 2009 03:37:56 -0400 (EDT)
  • References: <grpici$lkh$1@smc.vnet.net>

Hi,

a) x*y'[x])'[x] is nonsense, you mean D[x*y'[x],x]
b) x=0 is  a singular point of the ode, you can't start
    in a singular point

Regards
   Jens

Janpou Nee wrote:
> What went wrong in the foolwoing
> s = NDSolve[{(x*y'[x])'[x] + Sin[y[x]]*y[x] == 0, y[0] == 1, 
>     y'[0] == 0}, y[x], {x, 0, 30}];
> Plot[Evaluate[{y[x]} /. s], {x, 0, 30}, PlotStyle -> Automatic]
> 


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