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MathGroup Archive 2007

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Re: Re: ImplicitPlot errors

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75123] Re: [mg75088] Re: ImplicitPlot errors
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Wed, 18 Apr 2007 04:55:43 -0400 (EDT)
  • References: <200704170016.UAA08688@smc.vnet.net>

On 17 Apr 2007, at 09:16, Bill Rowe wrote:

> On 4/16/07 at 4:11 AM, w3bdevilREMOVE at THISw3bdevil.com (David Rees)
> wrote:
>
>> I've been trying to get ImplicitPlot to plot an implicit function
>> (naturally ;) ), but it throws errors to cryptic for me, even when
>> copying and pasting from the Mathematica function reference.
>
>> In[40]:= ImplicitPlot[{x^2 + x*y + y^2 == 7, y == 2*Sqrt[7/3]}, {x,
>> -5, 5}]
>
> Given:
>
> In[14]:=
> Reduce[{x^2+x*y+y^2\[Equal]7,y\[Equal]2*Sqrt[7/3]}]
>
> Out[14]=
> y == 2*Sqrt[7/3] && x == -Sqrt[7/3]
>
> that is your equations reduce to a single point, it should not
> be surprising ImplicitPlot complains
>

Actually

ImplicitPlot[{x^2 + x*y + y^2 == 7, y == 2*Sqrt[7/3]}, {x, -5, 5}]

works fine and displays a straight line and an ellipse, exactly as it  
should.

Andrzej Kozlowski


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