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Re: how fill PolarPlot?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg84445] Re: [mg84420] how fill PolarPlot?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Mon, 24 Dec 2007 04:51:09 -0500 (EST)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <20071223084806.AM19V.97874.root@eastrmwml18.mgt.cox.net>
  • Reply-to: murray at math.umass.edu

Yes, that does it, thank you.  But I'm still puzzled as to why I cannot 
use the Prolog as I gave it to do the filled right-hand leaf.

Bob Hanlon wrote:
> Show[{
>   RegionPlot[(x^2 + y^2)^(1/2) <= Cos[2 ArcTan[y/x]],
>    {x, 0, 1}, {y, -1/2, 1/2}],
>   PolarPlot[Cos[2 theta], {theta, 0, 2 Pi},
>    PlotStyle -> Red]},
>  PlotRange -> All]
> 
> Show[{
>   RegionPlot[(x^2 + y^2)^(3/2) <= x^2 - y^2,
>    {x, 0, 1}, {y, -1/2, 1/2}],
>   PolarPlot[Cos[2 theta], {theta, 0, 2 Pi},
>    PlotStyle -> Red]},
>  PlotRange -> All]
> 
> 
> Bob Hanlon
> 
> ---- Murray Eisenberg <murray at math.umass.edu> wrote: 
>> I Mathematica 6 I have a PolarPlot, e.g., a 4-leaved rose:
>>
>>    PolarPlot[Cos[2 theta], {theta, 0, 2 Pi}]
>>
>> How can I fill the inside -- or, what I really want, just the leaf in 
>> the right half-plane -- with some color?
>>
>> I note that Filling does not seem to be an option for PolarPlot (or for 
>> what would be almost as good, ParametricPlot).
>>
>> I tried including the following (obtained by converting from :
>>
>>    Prolog->RegionPlot[(x^2 + y^2)^(3/2) <= x^2-y^2, {x,-0.02,1},{y,-1,1},
>>        Frame->False, AspectRatio->Automatic]
>>
>> However, that led to a mysterious error message:
>>
>>    $Aborted is not a Graphics primitive or directive.
>>
>> (Perhaps because of an incompatibility of a Prolog with cartesian 
>> coordinates inside a polar coordinate plot??)
>>
>> -- 
>> 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
>>
> 

-- 
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


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