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将插值曲线约束于给定的区域之内是曲线形状控制中的重要问题。本文利用一种分母为线性的有理三次插值样条，讨论了将该种插值曲线约束于给定的折线、二次曲线之上、之下或之间的条件，并给出了数值例子。
Constraining the interpolation curve within a given area is an important issue in curvilinear shape control. In this paper, by using a rational cubic interpolation spline whose denominator is linear, the paper discusses the conditions for constraining the interpolation curve to a given fold line, quadratic curve, under or under a given numerical example.