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6.54.8  Graph of a quadric: quadric

The quadric command draws a quadric.


Example.
Input:

quadric(7*x^2+4*y^2+4*z^2+4*x*y-4*x*z-2*y*z-4*x+5*y+4*z-18)

Output:

Ellipsoid of center [0.407407407407,-0.962962962963,-0.537037037037]


See also the next section for the parametric equation of the quadric.


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