【Python】How to swap two columns in a 2d numpy array? - 101 Numpy Exercises
Q:
変数arrのカラム0とカラム1を入れ替えなさい
arr = np.arange(9).reshape(3,3) #> array([[0, 1, 2], #> [3, 4, 5], #> [6, 7, 8]])
A:
arr = arr[:, [1, 0, 2]] #> array([[1, 0, 2], #> [4, 3, 5], #> [7, 6, 8]])