一类分段（片）光滑、并且在各段交接处也有一定光滑性的函数。简称样条。样条一词来源于工程绘图人员为了将一些指定点连接成一条光顺曲线所使用的工具，即富有弹性的细木条或薄钢条。由这样的样条形成的曲线在连接点处具有连续的坡度与曲率。-A class of subparagraph (piece) smooth, and there are certain sections junction smooth function. Called spline. The term comes from the engineering drawing spline staff to some of the designated point of connection into a smoothing curve tools, namely, thin flexible thin strips of wood or steel bars. By the formation of such a spline curve connecting points with continuous slope and curvature.