中文说明：
主成分分析，贡献率排序，各成分贡献率，累计贡献率。自己输入数据矩阵和想要的主成分个数，有大量中文注释
English Description：
Principal component analysis, contribution rate ranking, contribution rate of each component, cumulative contribution rate. Input the data matrix and the number of principal components, there are a lot of Chinese comments