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MathGroup Archive 2006

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Re: Help !! plot roots of an expression

  • To: mathgroup at
  • Subject: [mg72428] Re: [mg72349] Help !! plot roots of an expression
  • From: Bob Hanlon <hanlonr at>
  • Date: Wed, 27 Dec 2006 06:11:18 -0500 (EST)
  • Reply-to: hanlonr at

poly=(w-w1) (w + 2  q +en^2 +  s w^3) + r;


s*w^4 - s*w1*w^3 + w^2 + (en^2 + 2*q - w1)*w + r - en^2*w1 - 2*q*w1





Bob Hanlon

---- mintoo <varun.tangri at> wrote: 
> I have a polynomial. A simple example is like this
> (w-w1) (w + 2  q +en^2 +  s w^3) + r
> The actual example is more complicated.  It is a function of several
> variables e.g. q, en, s, r etc..
> I also need to Collect & FullSimplify this expression.
> Finally, from that result, I want to plot the roots of this polynomial
> (imaginary & real part) vs. q (say) or vs en etc.. other variables can
> be given fixed values.
> I'll the thankful if you give me hints how to do this!!

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