Services & Resources / Wolfram Forums / MathGroup Archive

MathGroup Archive 2012

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

Search the Archive

problem with DSolve and spheroidal harmonics

  • To: mathgroup at
  • Subject: [mg128292] problem with DSolve and spheroidal harmonics
  • From: Tom Dickens <tomdickens at>
  • Date: Fri, 5 Oct 2012 02:49:27 -0400 (EDT)
  • Delivered-to:
  • Delivered-to:
  • Delivered-to:
  • Delivered-to:


I wonder if this is a bug. I'm working on a project involving
spheroidal harmonics, and tried the following example from the Help:

DSolve[(1 - x^2) y''[x] -  2 x y'[x] + (SpheroidalEigenvalue[n, m, c]
+ c^2 (1 - x^2) - m^2-(  1 - x^2)) y[x] == 0, y, x]

 {{y -> Function[{x},  C[1] SpheroidalPS[n, m, c, x] + C[2]
SpheroidalQS[n, m, c, x]]}}

This shows (in the Help) that the defining differential equation is
solved correctly. However, when I run it in either v7 or v8 I get a
differential root object

c^2+m^2-SpheroidalEigenvalue[n,m,c])+2 -[FormalX]

Any thoughts?


  • Prev by Date: Re: Integrating over 3D vector
  • Next by Date: Markers in list plot
  • Previous by thread: Re: List manipulation?
  • Next by thread: Re: problem with DSolve and spheroidal harmonics