Re: coding problem
- To: mathgroup at smc.vnet.net
- Subject: [mg60193] Re: [mg60176] coding problem
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Wed, 7 Sep 2005 04:03:51 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
soln=y[x]/.DSolve[{x*y''[x]+(1+x)*y'[x]==0},y[x],x][[1]]
C[2] + C[1]*ExpIntegralEi[-x]
y'[0] is not defined
Limit[D[soln,x],x->0]
C[1]*Infinity
Bob Hanlon
>
> From: "Ming Hong" <zhongming at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/09/06 Tue AM 01:26:47 EDT
> Subject: [mg60193] [mg60176] coding problem
>
> I am trying to solve the following equations:
>
> xy''+(1+x)y'=0
> xy'(0)=-1/2
> y(Infinity)=0
>
> Here is what I put into Mathematica:
>
> Dsolve[{x*y''[x]+(1+x)*y'[x]==0,x*y'[0]==-1/2,y[Infinity]==0},y,x]
>
> It didn't work and I can not figure out why.
>
> Thanks for your help!
>
> Ming
>
>