python接合マトリクスを利用する-numpy.r_[]とnumpy.c_[]

import numpy as  np
xx=np.array([[1,2,4],
    		 [12,3,4]])
yy=np.array([2,3,10,12,3,1])
>>> xx.ravel().shape,yy.shape
((6,), (6,))

>>> xx.ravel()
array([1,2,3,4,12,3,4])

>>> np.c_[xx,xx]
array([[ 1,  2,  4,  1,  2,  4],
       [12,  3,  4, 12,  3,  4]])
       
>>> np.c_[(xx.ravel(),yy]
array([1,  2],
      [2,  3],
      [4, 10],
      [12,12],
      [3,  3],
      [4,  1])

>>> np.r_[xx.ravel(),yy], np.r_[xx.ravel(),yy].shape
(array([ 1,  2,  4, 12,  3,  4,  2,  3, 10, 12,  3,  1]), 
(12,))