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Re: dark halo around gaussian peak in Plot3D?

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  • Subject: [mg130103] Re: dark halo around gaussian peak in Plot3D?
  • From: David Reiss <dbreiss at gmail.com>
  • Date: Sat, 9 Mar 2013 05:27:24 -0500 (EST)
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  • References: <20130308035122.485BC6797@smc.vnet.net> <khdm76$f0g$1@smc.vnet.net>

It probably has to do with numerical inaccuracies.  The problem is
removed by "Chop"ing the numerical output:

Plot3D[Chop@Evaluate@PDF[BinormalDistribution[0], {x, y}], {x, -40,
  40}, {y, -40, 40}, PlotRange -> All, PlotPoints -> 50]

--David


On Mar 8, 4:46 pm, "Michael B. Heaney" <mhea... at alum.mit.edu> wrote:
> Here is simple example that demonstrates the problem:
>
> Plot3D[PDF[BinormalDistribution[0], {x, y}], {x, -40, 40}, {y, -40, 40},
>
>  PlotRange -> All, PlotPoints -> 200]
>
> Thanks,
>
> Michael
>
>
>
>
>
>
>
>
>
> On Thu, Mar 7, 2013 at 8:49 PM, Bob Hanlon <hanlonr... at gmail.com> wrote:
> > I don't see a "dark halo" with the following
>
> > Plot3D[
> >  PDF[BinormalDistribution[0], {x, y}],
> >  {x, -3, 3}, {y, -3, 3}]
>
> > Can you send a simple example that demonstrates the problem?
>
> > Bob Hanlon
>
> > On Thu, Mar 7, 2013 at 10:51 PM, Michael B. Heaney <mhea... at alum.mit.edu>
> > wrote:
>
> > > Hi,
>
> > > When I plot a gaussian peak in Plot3D, there is a dark halo around the
> > > peak. Why is this? How can I get rid of it?
>
> > > Thanks,
>
> > > Michael
>
> > > --
> > > ----------------------------------------------------------
> > > Michael B. Heaney
> > > 3182 Stelling Drive
> > > Palo Alto, CA 94303 USA
> > > mhea... at alum.mit.edu
> > >www.linkedin.com/in/michaelbheaney
> > > ----------------------------------------------------------
>
> --
> ----------------------------------------------------------
> Michael B. Heaney
> 3182 Stelling Drive
> Palo Alto, CA 94303 USA
> mhea... at alum.mit.eduwww.linkedin.com/in/michaelbheaney
> ----------------------------------------------------------




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