Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2013

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

Search the Archive

Re: NDSolve differences between mathematica 8 and 9

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129584] Re: NDSolve differences between mathematica 8 and 9
  • From: Alex Krasnov <akrasnov at eecs.berkeley.edu>
  • Date: Sat, 26 Jan 2013 01:40:36 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-newout@smc.vnet.net
  • Delivered-to: mathgroup-newsend@smc.vnet.net
  • References: <20130125063352.E5EBC68A8@smc.vnet.net>

I do not have Mathematica 9 here. However, one issue with your expression 
is that the symbol for the imaginary unit begins with a capital letter, as 
do all other built-in Mathematica symbols.

Alex


On Fri, 25 Jan 2013, Teresa wrote:

> Hello,
>
> I am using mathematica 9 and having some problems with a particular expression, but when I tried it on mathematica 8 it worked perfectly. My expression is:
>
> NDSolve[{D[T[n,z],n]+i 2 D[T[n,z],{z,2}]+z^2 T[n,z]==0,T[0,z]==1,Derivative[0,1][T][n,5]==0,Derivative[0,1][T][n,0]==0},T,{n,0,5},{z,0,5}]
>
> where i is the imaginary number, and on both I had a new window to work on, with nothing having been done previously on it.
>
> Mathematica 8 gave me this:
> {{T-> InterpolatingFunction[{{0.,5.},{0.,5.}},<>]}}
>
> and mathematica 9 gave me this:
> NDSolve::ndnum : Encountered non-numerical value for a derivative at n==0.`.>>
>
> Does anyone know what is going on here? I cannot use mathematica 8, as I do not have continual access to that machine.
>
> Thank you for your help.
>



  • Prev by Date: sorting
  • Next by Date: Re: something wrong with my code??
  • Previous by thread: NDSolve differences between mathematica 8 and 9
  • Next by thread: Re: NDSolve differences between mathematica 8 and 9