在HHT变换后，可用于计算平均周期，即用整个序列的长度分别除以极大值点个数和极小值点个之后求平均-average period prediction

二维粒子群算法的matlab源程序，注释很详细，主要求解函数的极大、极小值。-Two dimensional particle swarm algorithm matlab source, annotation is very detailed, mainly to solve the function of the maximum and minimum.

利用割线法、进退法、黄金分割法等求解给定区间内的极大值与极小值-Using the secant method, advance and retreat, such as golden section method for solving the given interval maxima and minima