MathGroup Archive 1995

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

Search the Archive

numerical solutions to matrices??


I'm in a bit of a jam.  I have a system: phi'[t] == A.phi[t] that I have 
to numerically solve.  Both A and phi[t] are 18x18 matrices, A is 
composed completely of real numbers (mainly zeros), and I need to solve 
it for phi at various times and for various initial conditions for phi.  
I tried the Runge-Kutta programming example that came with my version of 
Mathematica and while it worked for 4x4 matrices it choked on an 18x18.  
It's needed for an orbit determination program that I am writing (in a 
desparate effort to pass a class).  If anyone knows how to solve a 
problem like this OR knows anything about orbit dtermination using 
Mathematica I would VERY much appreciate it.  Thanks!!





  • Prev by Date: Re: Help : Plotting vectors in 3D Graphics
  • Next by Date: Re: Mathematica 2.2.3 on Windows 95
  • Previous by thread: numerical solutions to matrices??
  • Next by thread: Re: numerical solutions to matrices??