等高线,梯度与方向函数 Contour Lines, Gradients and Directional Derivatives 曲线与曲面 Curves and Surfaces 双变数方程 Functions of Two Variables ..
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改变形状参数的值能整体或局部调控曲线与曲面的形状。
The shape of the curves and surfaces can be adjusted entirely or locally by changing the values of the shape parameters.
利用拉格朗日乘子法求解二次曲线和二次曲面之间的最小距离,给出了曲线与曲面相切的条件。
With the Lagrange multiplier method, the minimum distance of the center of a circle and a quadric surface was provided and the tangency condition of curve and surface was given.
有理曲线和曲面作为一类重要的逼近函数,在计算机辅助设计与制造中有着广泛的应用。
Rational curves and rational surfaces, which are a class of important approximation functions, are extensive applied in CAD/CAM.
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