thank you for your reply

I get the following error : 
a matrix from Full MatrixSpace of 4 by 1 dense matrices over Finite Field 
in a of size 2^8 cannot be converted to a matrix in Full MatrixSpace of 2 
by 2 dense matrices over Finite Field in a of size 2^8!

the following does not work too :

1. sage: P = sr.random_element()                                  
    sage: K = sr.random_element()

2. sage: P = '3243f6a8885a308d313198a2e0370734'  
    sage: K = '2b7e151628aed2a6abf7158809cf4f3c'



On Monday, March 16, 2015 at 11:59:52 PM UTC+1, Martin Albrecht wrote:
>
> On Monday 16 Mar 2015 12:45:07 Joe Ouni wrote: 
> > Hello , 
> > 
> > The following SR (2,1,1,4) worked fine. 
> > 
> > sage: sr = SR(2,1,1,4,star=True,aes_mode=True, 
> > gf2=True,allow_zero_inversions = True) 
> > sage: P = sr.vector([0, 0, 1, 0]) 
> > 
> > sage: K = sr.vector([1, 0, 0, 1]) 
> > sage: C = sr(P,K) 
> > sage: load mpolynomialsystem.py 
> > sage: F,s = sr.polynomial_system(P,K) 
> > 
> > but when I try the same for SR (5,2,2,8) does not work. 
> > I tried using 
> > sage: P = sr.vector([0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 
> 0, 
> > 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1]) 
> > 
> > sage: K = sr.vector([1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 
> 0, 
> > 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0]) 
>
> What error are you seeing? 
>   
> > I need it for my work absolutely. 
> > Thanks in advance 
>

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