Re: how fill PolarPlot?

*To*: mathgroup at smc.vnet.net*Subject*: [mg84427] Re: how fill PolarPlot?*From*: "Steve Luttrell" <steve at _removemefirst_luttrell.org.uk>*Date*: Mon, 24 Dec 2007 04:41:36 -0500 (EST)*References*: <fkla2t$3sh$1@smc.vnet.net>

If you reformulate your problem as Abs[Cos[\[Theta]]^2-Sin[\[Theta]]^2] > r^2 then this does what you want: RegionPlot[Abs[(x^2-y^2)/(x^2+y^2)]>Sqrt[x^2+y^2],{x,-1,1},{y,-1,1}] Stephen Luttrell West Malvern, UK "Murray Eisenberg" <murray at math.umass.edu> wrote in message news:fkla2t$3sh$1 at smc.vnet.net... >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 >