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MathGroup Archive 2007

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Re: Polar Plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82715] Re: Polar Plot
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Tue, 30 Oct 2007 03:15:48 -0500 (EST)
  • References: <fg4dhs$6dc$1@smc.vnet.net>

Miguel wrote:
> How can I to plot a polar expresion in implicit form. For example,
> r^2==3+2*r*Cos[teta]

I believe that there is no built-in function for this, so either try to 
write it in an explicit form and use PolarPlot[],

Solve[r^2 == 3 + 2*r*Cos[teta], r]

or write the expression in Cartesian coordinates and use ContourPlot[]

r^2 == 3 + 2*r*Cos[teta] //. {r -> Sqrt[x^2 + y^2], Cos[teta] -> x/r}

-- 
Szabolcs


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