MathGroup Archive 2005

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RSolve and complex solutions

  • To: mathgroup at
  • Subject: [mg54693] RSolve and complex solutions
  • From: skirmantas.janusonis at (Skirmantas)
  • Date: Sun, 27 Feb 2005 01:29:18 -0500 (EST)
  • Sender: owner-wri-mathgroup at

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? 

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