mat数据格式是Matlab数据存储的标准格式，scipy可用于python.读取io中函数loadmat()的mat文件。
importscipy.ioasscio path='ex3data1.mat' data=scio.loadmat(path) type(data) dict#字典格式是data data.keys()#查看字典键 dict_keys(['__header__','__version__','__globals__','X','y']) X1=data['X']#选择所需的数据；数组格式 array([0.，0.，0.，0.，...,0.,0.,0.], [0.，0.，0.，0.，0.，...,0.,0.,0.], [0.，0.，0.，0.，0.，...,0.,0.,0.], ..., [0.，0.，0.，0.，0.，...,0.,0.,0.], [0.，0.，0.，0.，0.，...,0.,0.,0.], [0.，0.，0.，0.，0.，...,0.,0.,0.]])
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