[Cado-nfs-discuss] Block Wiedemann (Paul Zimmermann)

Jhon Alejandro M alejandromelo at unicauca.edu.co
Mon Dec 3 15:06:29 CET 2018

Mr Zimmermann

Your answer has been great very helpful. I have successfully executed block
wiedemann algorithm with matrices greater than 100 rows per 100 columns,
but with smaller matrices, the following error appears

-The current code expects a column permutation replicated on rows, not the
converse. There is little adaptation work, but yet to be done. Maybe you
could pass "--reorder columns" to mf_bal ?

I don't understand the message error.  ¿How can I solve it?  or ¿Why does
the error appears?

by last. I have been trying to understand the output files of bwc but I
don`t understand the output format. ¿How should I interpret the K.sols file
<s1> - <s2>. <J> .txt? I am trying to solve matrices GF(2) but in the
output appears hex numbers

Thanks and Regard
Jhon Melo

El mié., 21 nov. 2018, 3:55 a. m., paul zimmermann <Paul.Zimmermann at inria.fr>

>        Hi Jhon,
> > From: Jhon Alejandro M <alejandromelo at unicauca.edu.co>
> > Date: Tue, 20 Nov 2018 16:31:06 -0500
> >
> > Hello, my name is Jhon. I am university student of Universidad del
> cauca. I
> > am implementing Quadratic Sieve algorithm. I am trying to implement Block
> > Wiedemann algorithm. ¿Can I run just the block-wiedemann part of
> cado-nfs?
> > and ¿Exist any example?
> >
> > Thanks and Regard
> > Jhon Melo
> > Universidad del Cauca Colombia
> the simplest way to get an example is to run the README example:
> $ export CADO_DEBUG=true
> $ ./cado-nfs.py
> 90377629292003121684002147101760858109247336549001090677693 workdir=/tmp/c60
> Then look at /tmp/c60/c60.bwc.stdout.1: its first line contains an example
> of
> command line of bwc.pl, the Perl script that calls Block Wiedemann.
> Additional documentation can be found in linalg/bwc/README.
> Best regards,
> Paul Zimmermann


*Hacia una
Universidad comprometida con la Paz Territorial*
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