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MathGroup Archive 2007

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Re: ImplicitPlot errors

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75088] Re: ImplicitPlot errors
  • From: Bill Rowe <readnewsciv at sbcglobal.net>
  • Date: Mon, 16 Apr 2007 20:16:35 -0400 (EDT)

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

<snip>

>What am I doing wrong? Even ImplicitPlot[x+y==2,{x,-4,4}] fails.

Doing ImplicitPlot[x+y==2,{x,-4,4}] works fine here. Try doing
this in a fresh session after loading Graphics`ImplicitPlot`
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