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MathGroup Archive 2007

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Re: Strange RegionPlot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81558] Re: [mg81532] Strange RegionPlot
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Wed, 26 Sep 2007 21:53:20 -0400 (EDT)
  • References: <21620273.1190836738082.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

That does seem odd! Increasing PlotPoints helps, though:

RegionPlot[x + y < 4 && x - y > 3, {x, -20, 25}, {y, -20, 10},
  PlotPoints -> 100]

Or better yet:

RegionPlot[x + y < 4 && x - y > 3, {x, -20, 25}, {y, -20, 10},
  MaxRecursion -> 5]

Default recursion is only 3 for this plot, apparently.

Bobby

On Wed, 26 Sep 2007 05:53:50 -0500, Bruce Colletti <vze269bv at verizon.net>  
wrote:

> Re 6.0.1 under Windows XP.
>
> The region returned by:
>
> RegionPlot[x + y < 4 && x - y > 3, {x, -20, 25}, {y, -20, 10}]
>
> should be triangular.  Yet the apex is a short line segment and not a  
> vertex.
>
> What creates this segment, and what must one do to get the vertex?   
> Thankx.
>
> Bruce
>
>



-- 
DrMajorBob at bigfoot.com


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