what is the mean of function parity_check_matrix?

[Porlockzzz]

Did the funcition builds a regular Parity-Check Matrix H? But why the Matrix i get is not a Parity-Check Matrix,such as [1 0 1 0 0 0 0 1 1 1 0 0 0 0 0] [0 0 0 0 0 0 0 0 0 0 1 0 0 0 0] [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] [0 1 0 0 0 1 0 0 1 0 0 1 0 0 1] [0 0 0 0 0 0 0 0 0 1 0 0 0 0 0] [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] [0 0 0 0 0 1 1 0 0 1 0 0 0 1 1] [0 0 0 0 0 0 0 0 1 0 0 0 0 0 0] [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] [0 1 0 0 0 1 1 0 1 0 0 0 1 0 0] [0 0 0 0 0 0 0 0 0 0 0 0 0 1 0] [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]

[Porlockzzz]

Can you give me some reference materials if you are busy?thank you

[hichamjanati]

How can I help you if you don't provide me with the code you ran to get this output ... Please tell me exactly what you did to get this matrix and with which version of pyldpc so that I can reproduce this behavior.

[Porlockzzz]

Sorry,this my code

import numpy as np
from pyldpc import make_ldpc, encode, decode, get_message
n = 10
d_v = 4
d_c = 5
H, G = make_ldpc(n, d_v, d_c, systematic=True, sparse=True)
print(H)

And output is [[0 0 0 1 1 1 1 1 0 0] [0 0 0 0 0 0 0 0 1 0] [0 0 1 1 1 1 0 0 0 1] [0 0 0 0 0 0 0 0 1 0] [1 0 1 1 0 0 1 0 0 1] [0 0 0 0 0 0 0 1 0 0] [0 1 1 1 0 1 0 0 1 0] [0 0 0 0 0 0 1 0 0 0]]

so maybe is not a Parity-Check Matrix？

[hichamjanati]

Indeed this is weird, I'll dig in and will get back to you on that.

[hichamjanati]

It's fixed. Please clone the repo and install it locally with python setup.py develop for the latest version. Thanks for pointing this out.

[hichamjanati]

About the reference, if you are interested in LDPC codes in general, I recommend you to check https://www.researchgate.net/publication/283225722_Introducing_Low_Density_Parity_Check_LDPC_Codes

[Porlockzzz]

Thanks for the reference,You did a great fixed：）