MathGroup Archive 2005

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Quadratic Form Contours


Hi,

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?

best,

joerg


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