20070201, 22:56  #1 
Feb 2007
5 Posts 
Linear algebra in MPQS
Hi all, I'm an italian student and I need your support.
I'm implementing MPQS with GMP, the implemented sieving algorithm works fine and I obtain the sparse matrix representing the good relations that I can use to solve the linear algebra and find factors. My problem is just to solve the linear algebra. I need a C++ implementation or Pari/GP function that find these solutions using gaussian elimination or lanczos (faster, right?). Thx in advance! 
20070201, 23:20  #2 
Feb 2007
5 Posts 
I'll also appreciate if you indicate me a C++ library with a function that solves equations system over Z_2.
Lidia has a function named solve() but i am not sure that it works with sparse matrix modulo 2 and gives me a valid solution. bye Last fiddled with by R1zZ1 on 20070201 at 23:39 
20070202, 06:45  #3  
Tribal Bullet
Oct 2004
3,547 Posts 
Quote:
There are several MPQS implementations linked to the sticky at the top of the factoring forum; they all have to solve this problem, and there's plenty of code to browse. jasonp 

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