中文说明：
基于想要的主成分数量和精确度，采用matlab的pca函数进行主成分分析
English Description：
Based on the desired principal component and accuracy, PCA function of MATLAB is used for principal component analysis
PCA is based on principal component analysis and accuracy
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中文说明：
基于想要的主成分数量和精确度，采用matlab的pca函数进行主成分分析
English Description：
Based on the desired principal component and accuracy, PCA function of MATLAB is used for principal component analysis
pca_demo_2.m
pca_demo_1.m