dataMat = [[2,4,5], [2,4,6], [1,4,8], [1,2,4,]] means = np.mean(dataMat,axis = 0) #求每一列的均值 print(means) mean_dataMat = dataMat - means print(mean_dataMat) print('--------------------') m,n = np.shape(dataMat) means_tile = np.tile(means,(m,1)) print(means_tile) mean_dataMat = dataMat - means_tile print(mean_dataMat) #运行结果 [1.5 3.5 5.75] [[ 0.5 0.5 -0.75] [ 0.5 0.5 0.25] [-0.5 0.5 2.25] [-0.5 -1.5 -1.75]] -------------------- [[1.5 3.5 5.75] [1.5 3.5 5.75] [1.5 3.5 5.75] [1.5 3.5 5.75]] [[ 0.5 0.5 -0.75] [ 0.5 0.5 0.25] [-0.5 0.5 2.25] [-0.5 -1.5 -1.75]]
转载请标明出处:矩阵零均值化
文章来源: 矩阵零均值化