python do qr code 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