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(Principal component analysis, ranking of contribution rate, contribution rate of each component, and cumulative contribution rate. You enter the data matrix and the number of the principal components you want, with a large number of Chinese annotations)