中文说明：
通过excel将输入读入matlab中，计算文件第四列元素的最大值，最小值和均方根值，对应z波面拟合中的PV RMS的计算。上传文件中包括excel文件。
English Description：
Read the input into Matlab through Excel, and calculate the maximum, minimum and root mean square values of the fourth column of the file, corresponding to the calculation of PV RMS in Z-Wave surface fitting. The upload file includes excel file