MathGroup Archive: December 2002 [00138]

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Finding multiple roots

To: mathgroup at smc.vnet.net
Subject: [mg38225] Finding multiple roots
From: "Novak Petrovic" <novak at itee.uq.edu.au>
Date: Thu, 5 Dec 2002 03:36:03 -0500 (EST)
Organization: The University of Queensland, Australia
Sender: owner-wri-mathgroup at wolfram.com

Hi all,

I'm trying to find roots of the characteristic equation of a
dielectric-loaded waveguide. There are multiple roots of the equation and I
use FindRoot to find them. The sequence of roots is very important in my
further calculations.

Is there a routine or a clever way to (numerically) find all the roots of an
equation in a predefined values?

As it is now I have to look for each individual root manually and it gets a
bit tedious as the number of required modes increases.

Thanks a lot.

--
Regards,

Novak Petrovic
novak at itee.uq.edu.au

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