python qrcode libraryy code example
Example 1: python library to make qr codes
import qrcode
img = qrcode.make('Some data here')
Example 2: python qr decomposition
array = np.array([19, 14, 16, 13, 15,15,12,8,9,18,12,5 ]).reshape(4,3)
q,r = LA.qr(array)
r
# if diagonal exponent is zero, then v_i should be removed