中文说明：pca特征提取子程序，毕设用的算法优化非常好，几乎没有循环，相当节省时间，堪称经典，运行绝对正确！！
English Description：
PCA feature extraction subroutine, designed by the algorithm optimization is very good, almost no cycle, quite save time, can be called classic, run absolutely right!!
Implementation of PCA feature extraction with matlab code
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中文说明：pca特征提取子程序，毕设用的算法优化非常好，几乎没有循环，相当节省时间，堪称经典，运行绝对正确！！
English Description：
PCA feature extraction subroutine, designed by the algorithm optimization is very good, almost no cycle, quite save time, can be called classic, run absolutely right!!