[sage-support] Re: Patterson Algorithm

2017-02-22 Thread Johan S. H. Rosenkilde
Hi Panos The snippet you gave certainly does not work since it will compute the gcd of 1 and something else, which is - of course - 1. What you need is to compute the *half gcd* of R and g, i.e. run the Extended Euclidean algorithm about half-way and then stop. The Bezout relation from that i

[sage-support] Re: Patterson Algorithm

2017-03-07 Thread Panos Phronimos
Thanks Johan, I finally implement the decoder using lattice basis reduction (using LLL) The only thing left is to reduce the execution time of the decoder by finding the most efficient way to locate the errors via the error locator poynomial (something better than chien search) If you are inter

Re: [sage-support] Re: Patterson Algorithm

2017-03-07 Thread Johan S . H . Rosenkilde
Hi Panos, > I finally implement the decoder using lattice basis reduction (using LLL) I presume you mean F[x]-lattice basis reduction, i.e. row reduction of F[x] matrices (the LLL is for integer matrices). > The only thing left is to reduce the execution time of the decoder by > finding the mo

Re: [sage-support] Re: Patterson Algorithm

2017-06-11 Thread Juan Grados
Panos, I had write patterson algorithm here http://juaninf.blogspot.com.br/2013/04/function-make-div-with-id-mycell-sage.html . 2017-03-07 9:47 GMT-03:00 Johan S. H. Rosenkilde : > Hi Panos, > > > I finally implement the decoder using lattice basis reduction (using LLL) > > I presume you mean F[