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import cv2 

import numpy as np  

>>> c = np.zeros( (2,2) )

>>> a = np.array( [[1.0,2.0],[3.0,4.0] ]) >>> b = np.array( [[0.0,1.0],[1.0,0.0] ]) >>> d = cv2.gemm(a,b,1.0, c ,0.0 ) >>> d array([[2., 1.],        [4., 3.]]) >>> d = np.dot( a , b ) >>> d array([[2., 1.],        [4., 3.]])  

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