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MUPAD: plotting the intersection of two functions

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Dan on 18 Apr 2011
Dear sirs,
the problem I would like to solve is related to representation of constrained optimization problems in MUPAD, but in broader terms, this could apply to a variety of cases.
To exemplify, my problem is to trace on the surface of a target function like, for instance, z = x^2+y^2 its intersection with, say, a plane (the constraint) that according to its inclination would result on the surface of the target function in an ellipse, a circle or a parabola.
Of course, in a more general setting, the constraint itself needs not be linear.
The natural choice would seem plot::curve3d, but I am unable to parametrize the constraint function, particularly when it is a quadratic function such as an ellipse or a circle.
Also, all my initial equations are expressed in Cartesian coordinates.
Thanks to anyone who would share any useful suggestion on the subject.

Answers (1)

Christopher Creutzig
Christopher Creutzig on 28 Apr 2011
For the special case of intersecting with an axes-parallel plane, it may be worth checking out the second example in the documentation of plot::Scene3d. For the general case, I am afraid there is no generic ready solution.

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