说明：  %% PCA-kmeans方法实现对葡萄的理化指标进行聚类 % 《MATLAB数学建模方法与实践》(《MATLAB在数学建模中的应用》升级版)，北航出版社，卓金武、王鸿钧编著.
(% PCA-kmeans method was used to cluster the physical and chemical indexes of grapes. Mathematical Modeling Methods and Practice in MATLAB (Upgraded Edition of Application of MATLAB in Mathematical Modeling), edited by Zhuo Jinwu and Wang Hongjun, Beihang Publishing House.)