中文说明：matlab寻找峰值代码。函数可以直接调用，返回设定区域的峰值的横纵坐标，非matlab自带函数，可以寻找多个峰值。算法满足：1.超过一个闕值，此值不用设的太高2.每次检测到满足1条件中的值，判定是否为峰值，不是则继续寻找，是则暂存为temp3.继续检测半个周期的数据，如寻得比temp值大的峰值，存为temp并重复步骤3，无则能断定此值为满足要求的峰值，记录下来。
English Description：
Matlab to find the peak code. The function can be called directly to return the abscissa and ordinate of the peak value in the set area. It is not a function of MATLAB and can find multiple peaks. The algorithm meets the following requirements: 1. If there is more than one threshold value, this value should not be set too high. 2. Each time the value that meets the condition 1 is detected, determine whether it is a peak value. If it is not, continue to search, and if it is temporary stored as temp3. Continue to detect the data of half a cycle. If the peak value larger than temp3 is found, save it as tempand repeat step 3. If there is no, it can be determined that this value is a peak value that meets the requirements, and record it.