利用PCA方法对数据集进行降维，能提高识别效率。-Use PCA method to reduce the dimensionality of the data set can improve the recognition efficiency.

使用yale人脸数据库，用PCA降维方法来对人脸数据进行分类的MATLAB代码，附有人脸图片-Yale face , using PCA dimension reduction method to classify data of face of MATLAB code, and comes with a human face images