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MathGroup Archive 2007

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Plotting two functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg78326] Plotting two functions
  • From: SK <skhushrushahi at gmail.com>
  • Date: Thu, 28 Jun 2007 04:29:53 -0400 (EDT)

Hi

I have a 5th order equation of the form

eqntony445=r^5+(alpha*X)*r^4+(beta+Pp)*r^3+(delta*X)*r^2+(gamma+Pp)*r
+c*X==0

where alpha, beta, delta and gamma are other combination of terms that
I havent included for the sake of simplicity.

I can plot X with respect to r for various values of Pp

Plot[Evaluate[Table[X /. Flatten[Solve[eqntony445 == 0, X]], {Pp, 0,
20, 5}]], {r, -0.5, 0.5}]

The problem is I have another function of the form

V=Integrate[ ((Pp)/(s)*((r^3+r)/(r^2+1)^2)+2*r,X]

and need to plot it with respect to X. It keeps spitting out stuff of
the form Root, which is understandable for 5th order equations, but I
find that if I can plot V with respect to r then there must be a way I
can take those r values and translate them to X values. Any help will
be greatly appreciated.
Thanks
S



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