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MathGroup Archive 2006

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Re: solve ODE help?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72112] Re: [mg72089] solve ODE help?
  • From: "Chris Chiasson" <chris at chiasson.name>
  • Date: Wed, 13 Dec 2006 06:38:27 -0500 (EST)
  • References: <200612110955.EAA07170@smc.vnet.net>

use NDSolve or DSolve

On 12/11/06, learner <freephys at gmail.com> wrote:
>  Hi, everyone,
>  i am new to solve ode in mathematica. i am trying to solve two
> odes(not for hw :)).
> y'+ytan(x)=sin(2x)
>
> I use: NSolve[{Direvative[1][y][x]+y Tan[x]==Sin[2x]},y,x]
>
> and get reply saying that:
> InverseFunction::ifun: Inverse functions are being used. Values may be
> lost for multivalued inverses
>
> {{y[x]->cot[x](sin[2x]-y'[x]}} ,
> the mathematica did not solve the equation??
>
> Furthermore, I add condition that y==2 when x==0 by saying:
>
> NSolve[{Direvative[1][y][x]+y Tan[x]==Sin[2x],y[0]==2},y,x]
>
> but no help ? why?
> thanks
>
>


-- 
http://chris.chiasson.name/


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