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Re: solve ODE help?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg72134] Re: solve ODE help?
*From*: dh <dh at metrohm.ch>
*Date*: Wed, 13 Dec 2006 06:39:35 -0500 (EST)
*References*: <eljb9d$7h0$1@smc.vnet.net>
Hi learner,
write NDSolve instead of NSolve, Derivative instead of Direvative, but
you can also use the simplier y', and {x,xmin,xmax} instead of x.
the correct syntax is e.g.:
NDSolve[{y'[x] + y[x] Tan[x] == Sin[2x], y[0] == 2}, y, {x, 0, 1}]
Daniel
learner 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
>
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