Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1999
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

NDSolve of partial differentiel equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18442] NDSolve of partial differentiel equation
  • From: "Christian Damgaard" <cfd at dmu.dk>
  • Date: Wed, 7 Jul 1999 00:11:29 -0400
  • Organization: UNI2 Internet Kunde
  • Sender: owner-wri-mathgroup at wolfram.com

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 dmu.dk




  • Prev by Date: Re: Memory leak in function using dynamic programming
  • Next by Date: Converting notebook to pdf ?
  • Previous by thread: Re: Memory leak in function using dynamic programming
  • Next by thread: Re: NDSolve of partial differentiel equation