If I follow your cpde correctly, you are working on polynoms in X0,..,X3.
What you attempt to create would be a polynom in x00,..,x03,x10..x33.
Doubleplusungood...
You should probaby use expressions in SR and cast the resultant expression
in the ring of polynoms in x00,..x33.
BTW, you don't have to loop on your substitution : create a dictionary.
This gives :
p = 3
k.<t> = GF(2^p)
nvars = 4
vars_GF = []
vars_gf2 = []
vars_gf2subs = []
l = 0
for i in range(nvars):
vars_GF.append(var("X"+str(i)))
sum1 = 0
for j in range(p):
vars_gf2.append(var("x"+str(i)+str(j)))
sum1 = sum1 + vars_gf2[i*p+j]*(t^j)
l = l + 1
vars_gf2subs.append(sum1)
PR = PolynomialRing(k, nvars, names = vars_GF)
p = PR.random_element(degree=2)
Dic={vars_GF[i]:vars_gf2subs[i] for i in range(nvars)}
PR2=PolynomialRing(k, nvars*p, names = vars_gf2)
p2=PR2(SR(p).subs(Dic))
p2 might or might not be what you want.
There are probably more steamlined ways to accomplish what you want, but
I'm only discovering Sage...
HTH,
--
Emmanuel Charpentier
Le lundi 18 août 2014 07:18:26 UTC+2, juaninf a écrit :
>
> Dears members I need doing substitution of values vars_gf2subs in vars_GF
> variables on p polynomial. I'm trying p.subs(vars_GF[i]=vars_gf2subs[i]) bu
> tI get error. How I will be able to doing that?
>
> p = 3
> k.<t> = GF(2^p)
> nvars = 4
> vars_GF = []
> vars_gf2 = []
> vars_gf2subs = []
> l = 0
> for i in range(nvars):
> vars_GF.append(var("X"+str(i)))
> sum1 = 0
> for j in range(p):
> vars_gf2.append(var("x"+str(i)+str(j)))
> sum1 = sum1 + vars_gf2[i*p+j]*(t^j)
> l = l + 1
> vars_gf2subs.append(sum1)
>
> PR = PolynomialRing(k, nvars, names = vars_GF)
> p = PR.random_element(degree=2)
> for i in range(nvars):
> print vars_GF[i]
> p.subs(vars_GF[i]=vars_gf2subs[i])
>
> --
> ---------------------------------------------------------------------
> MSc. Juan del Carmen Grados Vásquez
> Laboratório Nacional de Computação Científica
> Tel: +55 21 97633 3228
> (http://www.lncc.br/)
> http://juaninf.blogspot.com
> ---------------------------------------------------------------------
>
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