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MathGroup Archive 1999

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Re: NDSolve of partial differentiel equation

  • To: mathgroup at
  • Subject: [mg18696] Re: NDSolve of partial differentiel equation
  • From: Don Paddleford <don-paddleford at>
  • Date: Thu, 15 Jul 1999 01:46:11 -0400
  • Organization: AT&T WorldNet Services
  • References: <7lul3m$>
  • Sender: owner-wri-mathgroup at

Christian Damgaard wrote:
> Dear All,
> I am trying to solve a set of partial differential equation with three
> variables nummerically. However, as far as I see Mathematica only allows two
> variables in NDSolve. Is that correct ?
> The equations look like: px[x,y,t]==expr, py[x,y,t]==expr
> with boundary conditions: px[a,y,t]==0, px[b,y,t]==0,py[x,c,t]==0,
> py[x,d,t]==0
> and initial conditions: px[x,y,0]==expr,py[x,y,0]==expr
> If have tried something like:
> NDSolve[ {px[x,y,t]==expr, py[x,y,t]==expr, px[a,y,t]==0,
> px[b,y,t]==0,py[x,c,t]==0, py[x,d,t]==0,
> px[x,y,0]==expr,py[x,y,0]==expr},{px[x,y,t],py[x,y,t]},{x,x0,x1},{y,y0,y1},{
> t,t0,t1}]
> but it replyes that there are to many variables.
> replacing {x,x0,x1},{y,y0,y1},{t,t0,t1} with {{x,x0,x1},{y,y0,y1},{t,t0,t1}}
> does not work either.
> Christian Damgaard
> cfd at


I raised this question to Wolfram a while back and was told NDSolve 
would handle two variable PDE's at most.

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