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MathGroup Archive 2005

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Re: coding problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60184] Re: coding problem
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 6 Sep 2005 05:28:49 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <dfj9bg$rfm$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
a) the function name is DSolve[] with a
b) you can reduce the order of the ode
   with u[x]==y'[x] and you get
   DSolve[{x*u'[x] + (1 + x)*u[x] == 0}, u[x], x]
c) from this solution, you see that it will never 
converge
   at x==0

Regards
  Jens

"Ming Hong" <zhongming at gmail.com> schrieb im 
Newsbeitrag news:dfj9bg$rfm$1 at smc.vnet.net...
|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
| 



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