Python_sklearn機器學習庫學習筆記（六） dimensionality-reduction-with-pca

# 用PCA降維 #計算協方差矩陣 import numpy as np X=[[2,0,-1.4], [2.2,0.2,-1.5], [2.4,0.1,-1], [1.9,0,-1.2]] np.cov(np.array(X).T) #計算特徵向量 import numpy as np w,v=np.linalg.eig(np.array([[1,-2],[2,-3]])) prin

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