My objective is to sort Y first (increasing, from 0 to 3), then sort the X according to the sorted Y. Note that X and Y are one to one. Y = np.random.randint(0, 4, (2, 10,)) print("before Y", Y.shape) # before Y (2, 10) print(Y) print() idx = np.argsort(Y, axis=1) Y_ordered = np.take_along_axis(Y, idx, axis=1) print("reordered Y", Y_ordered.shape) # reordered Y (2, 10) print(Y_ordered) print() ### X = np.random.rand(2, 10, 64, 64) X_ordered = np.take_along_axis(X, idx, axis=1) # ValueError: `indices` and `arr` must have the same number of dimensions print("reordered X", X_ordered.shape) print(X_ordered) print() I got the Y_ordered that I want, but how to broadcast the same idx on another array X with different shape, but have the same size in the first 2 dimensions. Continue reading...