Re: How to write code for Plotting Polar Coordinates in

*To*: mathgroup at smc.vnet.net*Subject*: [mg127258] Re: How to write code for Plotting Polar Coordinates in*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Wed, 11 Jul 2012 18:22:52 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net*References*: <20120711061622.C3B356839@smc.vnet.net>*Reply-to*: murray at math.umass.edu

I have no idea what "equation" you're trying to plot. You have two equations, one for r and the other for theta. But neither equation makes any sense in Mathematica syntax. Moreover, I cannot make any _mathematical_ sense of what you're trying to express with those two equations. Ordinarily, a polar plot involves a function r(theta) = some formula involving theta, which is interpreted then as describing distance from the pole as a function of angle. In Mathematica, such a function would take the form r[theta_] := expression involving theta for example: r[theta_] := 2 Cos[3 theta] And then you would use PolarPlot like this: PolarPlot[r[theta], {theta, 0, Pi}] But to begin, you have to explain carefully and precisely, in unambiguous language/notation, what you're trying to do. And then you have to learn elementary Mathematica syntax as well as how to use the marvelous and extensive help system (Documentation Center) that's built into Mathematica -- which includes many, many examples. On 7/11/12 2:16 AM, Rahul Chakraborty wrote: > Dear All, > > Kindly guide me regarding how to have polar plot in mathematica. > > I have gone through function PolarPlot in virtual book but unable to > get my syntax correctly for the following eqn: > > > r^.=r(1-r^2) > > \[Theta]^.=1 > Please guide. -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**How to write code for Plotting Polar Coordinates in r and theta ?***From:*Rahul Chakraborty <rahul.6sept@gmail.com>