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Re: NDSolve differences between mathematica 8 and 9
Posted:
Jan 26, 2013 1:38 AM


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 builtin 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 nonnumerical 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. >



