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MathGroup Archive 2006

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Re: Plotting iso-distance curves from matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71003] Re: [mg70958] Plotting iso-distance curves from matrices
  • From: Carl Woll <carlw at wolfram.com>
  • Date: Sat, 4 Nov 2006 04:08:16 -0500 (EST)
  • References: <200611030639.BAA20920@smc.vnet.net>

Uwe Ziegenhagen wrote:

>Hi,
>
>I would like to plot iso-distance curves (in 2 dimensions) satisfying
>the following condition:
>
>{ x \in R^2 | (x-x_0)^T A (x-x_0) = d^2}
>
>with x a 2x1 vector, ^T denoting the transposed sign and A a positive
>definite matrix. Any way to do it in Mathematica?
>
>Uwe
>  
>
Use ContourPlot. For example:

a = Table[ Random[], {2}, {2}];

ContourPlot[{x-2,y-1}.a.{x-2,y-1}, {x,-5,5}, {y,-5,5}]

Carl Woll
Wolfram Research


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