中文说明：这个函数查找一个盘形凸轮与往复式平脸跟随凸轮轮廓。它接受基圆半径R0，y和YP矢量（全部在位移为单位），和凸轮角度theta（RAD）。这些载体都应该对应于凸轮的旋转从0到2PI一个完整的周期。显然，更小的步长的更精确和更平滑的凸轮轮廓的最后情节。
English Description：
This function finds the cam profile for a disk cam with an reciprocating flat-face follower. It accepts the base circle radius Ro, vectors of y and yp (all in displacement units), and cam angle theta (RAD). These vectors should all correspond to a full cycle of cam rotation from 0 to 2*PI. Obviously the smaller the stepsize the more accurate and smoother the final plot of cam profile.