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MathGroup Archive 2006

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Re: Eliminate Complex Roots

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64438] Re: Eliminate Complex Roots
  • From: Paul Abbott <paul at physics.uwa.edu.au>
  • Date: Fri, 17 Feb 2006 04:11:46 -0500 (EST)
  • Organization: The University of Western Australia
  • References: <dspffj$cd0$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In article <dspffj$cd0$1 at smc.vnet.net>, bghiggins at ucdavis.edu wrote:

> Suppose I have the following equation and I want to plot the real roots
> using Plot as a function of the parameter b
> 
> a^3 + 10*a^2 - 15*a + b == 0

Why not use ImplicitPlot?

  ImplicitPlot[a^3 + 10 a^2 - 15 a + b == 0, 
     {a, -12, 3}, {b, -20, 10}, PlotPoints -> 100, AspectRatio -> 1/3]; 

Cheers,
Paul

_______________________________________________________________________
Paul Abbott                                      Phone:  61 8 6488 2734
School of Physics, M013                            Fax: +61 8 6488 1014
The University of Western Australia         (CRICOS Provider No 00126G)    
AUSTRALIA                               http://physics.uwa.edu.au/~paul


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