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Numpy array のスライスで気づいたこと

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Numpy array のスライスで気づいたことをメモ

例えば、
shapeが(X,4) (X行4列)のarr_1があったとして、

arr_1[:,0:5]

arr_1

は同じ配列であるということです。

これが正しいことは引き算してみると分かります。
arr_2 = arr_1[:,0:5]-arr_1
print(arr_2)
print(arr_2.max(axis = 0))

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