import numpy as np x = np.array([1,2,3]) y = np.array([4,5,6])

It is desired to form a 2D numpy array z where the first column of z is x and the second column of z is y. What statement will do this?

Answer:

z = np.concatenate((x.reshape((3,1)),y.reshape((3,1))),axis=1)

My question is what the axis means. I have been reading my notes over and over again and fail to understand what an axis/axes is in numpy.