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MathGroup Archive 2005

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Quadratic Form Contours

  • To: mathgroup at
  • Subject: [mg57652] Quadratic Form Contours
  • From: Joerg Schaber <schaber at>
  • Date: Fri, 3 Jun 2005 05:33:36 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


does anybody know a simple way to calculate 2-D ellipsoids in x={x1,x2} 
of a quadatric form solving xAx=b for a graphical output, i.e. contour 
lines of the quadrtic form expressed as the Graphics primitive Ellipsoid?
I suppose that the option ParameterConfidenceRegion of NonlinearRegress 
does something like that, but how?



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