MathGroup Archive 2005

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

Search the Archive

Re: RSolve and complex solutions


Hi,

a) RSolve work pure symbolical, there can't be rounding errors
b) RSolve[] will Solve[] at least a system of equations and
   this can produce complex solutions even for real input.

Regards
  Jens

"Skirmantas" <skirmantas.janusonis at yale.edu> schrieb im Newsbeitrag 
news:cvrq1t$p28$1 at smc.vnet.net...
> It may be a basic math question, but it would be helpful if somebody
> could briefly comment on it. If I have a system of recursion equations
> with real coefficients and solve it numerically step-by-step, all my
> solutions at all time steps are (obviously) real. If, however, I use
> RSolve to get the general formulas for these solutions, some of them
> become complex numbers. My understanding is the imaginary parts of
> these numbers are due to rounding errors and the actual solutions are
> only the real parts. Am I right?
> 



  • Prev by Date: Bug in PDF[MultinormalDistribution[..],..]
  • Next by Date: Re: Print graphics in smaller size
  • Previous by thread: Re: RSolve and complex solutions
  • Next by thread: Changing Plot Axis Displays