MathGroup Archive 1999

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NSolve, NDSolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg16401] NSolve, NDSolve
  • From: cecchetto at its.chem.uva.nl (Elio Cecchetto)
  • Date: Thu, 11 Mar 1999 02:17:01 -0500
  • Organization: The Math Forum
  • Sender: owner-wri-mathgroup at wolfram.com

I have the following differential equation to solve in the functions
th[z] and phi[z].
As first I used the EulerEquations to expand the differential equation
in two of them. But then I can't introduce boundary conditions in two
different points at the same time.
phi[0]==th[0]==0,
phi[L]==Pi/2
th[L]==0

where L,k1,k2,k3,Ea and V are all fixed parameters


(k1 Cos [th[z]]^2+k3 Sin[th[z]]^2)/2 th'[z]^2+
1/2 Cos[th[z]]^2(k2 Cos[th[z]]^2+k3 Sin[th[z]]^2)phi'[z]^2
- Ea V^2/(8Pi) Sin[th[z]]^2 == 0

Do anyone have any suggest?
Probably the solution is trivial, but I do not get it!

Elio


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