Help !! plot roots of an expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg72349] Help !! plot roots of an expression*From*: "mintoo" <varun.tangri at gmail.com>*Date*: Tue, 26 Dec 2006 07:31:02 -0500 (EST)

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!!