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python qr decomposition

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CertainBadProgrammer answered on March 14, 2020 Popularity 9/10 Helpfulness 4/10

answer python qr decomposition

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python qr decomposition

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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

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Tags: python qr-decomposition

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Contributed on Sep 09 2020

CertainBadProgrammer

0 Answers Avg Quality 2/10

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how to display qr code in python

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import os
import qrcode

img = qrcode.make("https://Your-URL-here")

img.save("qr.png", "PNG")

os.system("display qr.png")

Popularity 10/10 Helpfulness 7/10 Language python

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Tags: display

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Contributed on Apr 14 2022

Piche Traful

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python qr code

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# pip install pyqrcode
#pip install pypng

import pyqrcode
import png
from pyqrcode import QRCode

string = 'www.google.com'
url = pyqrcode.create(string)

url.svg("myqr.svg" , scale = 8)
url.png("myqr.png" , scale = 6)

Popularity 10/10 Helpfulness 6/10 Language python

Source: Grepper

Tags: python py

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Contributed on Dec 09 2022

Adam, the developer

0 Answers Avg Quality 2/10

python library to make qr codes

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pip install qrcode[pil]

Popularity 10/10 Helpfulness 5/10 Language python

Source: pypi.org

Tags: python py

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Contributed on Mar 14 2020

Upset Unicorn

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qr decomposition python

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#!/usr/bin/env python3

import numpy as np

def qr(A):
    m, n = A.shape
    Q = np.eye(m)
    for i in range(n - (m == n)):
        H = np.eye(m)
        H[i:, i:] = make_householder(A[i:, i])
        Q = np.dot(Q, H)
        A = np.dot(H, A)
    return Q, A

def make_householder(a):
    v = a / (a[0] + np.copysign(np.linalg.norm(a), a[0]))
    v[0] = 1
    H = np.eye(a.shape[0])
    H -= (2 / np.dot(v, v)) * np.dot(v[:, None], v[None, :])
    return H

# task 1: show qr decomp of wp example
a = np.array(((
    (12, -51,   4),
    ( 6, 167, -68),
    (-4,  24, -41),
)))

q, r = qr(a)
print('q:\n', q.round(6))
print('r:\n', r.round(6))

# task 2: use qr decomp for polynomial regression example
def polyfit(x, y, n):
    return lsqr(x[:, None]**np.arange(n + 1), y.T)

def lsqr(a, b):
    q, r = qr(a)
    _, n = r.shape
    return np.linalg.solve(r[:n, :], np.dot(q.T, b)[:n])

x = np.array((0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10))
y = np.array((1, 6, 17, 34, 57, 86, 121, 162, 209, 262, 321))

print('\npolyfit:\n', polyfit(x, y, 2))

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Source: rosettacode.org

Tags: python py

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Contributed on Oct 03 2022

barisx

0 Answers Avg Quality 2/10

create qr code in python

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# Import QRCode from pyqrcode
import pyqrcode
import png
from pyqrcode import QRCode
  
  
# String which represents the QR code
s = "www.codingforfree.com"
  
# Generate QR code
url = pyqrcode.create(s)
  
# Create and save the svg file naming "myqr.svg"
url.svg("myqr.svg", scale = 8)
  
# Create and save the png file naming "myqr.png"
url.png('myqr.png', scale = 6)

Popularity 10/10 Helpfulness 4/10 Language python

Source: Grepper

Tags: python py

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Contributed on Jul 28 2022

Travinth Dayalaeaswaran

0 Answers Avg Quality 2/10

python qr generator

Comment

import qrcode
img = qrcode.make('Some data here')
type(img)  # qrcode.image.pil.PilImage
img.save("some_file.png")

Popularity 9/10 Helpfulness 3/10 Language python

Source: pypi.org

Tags: generator gene

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Contributed on Aug 20 2022

San Wai Tang

0 Answers Avg Quality 2/10

python qr generator

Comment

-1

pip install qrcode[pil]

Popularity 9/10 Helpfulness 1/10 Language python

Source: pypi.org

Tags: generator gene

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Contributed on Aug 20 2022

San Wai Tang

0 Answers Avg Quality 2/10

python qr decomposition

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