Function: nfalgtobasis
Section: number_fields
C-Name: algtobasis
Prototype: GG
Help: nfalgtobasis(nf,x): transforms the algebraic number x into a column
 vector on the integral basis nf.zk.
Doc: Given an algebraic number $x$ in the number field $\var{nf}$,
 transforms it to a column vector on the integral basis \kbd{\var{nf}.zk}.
 \bprog
 ? nf = nfinit(y^2 + 4);
 ? nf.zk
 %2 = [1, 1/2*y]
 ? nfalgtobasis(nf, [1,1]~)
 %3 = [1, 1]~
 ? nfalgtobasis(nf, y)
 %4 = [0, 2]~
 ? nfalgtobasis(nf, Mod(y, y^2+4))
 %5 = [0, 2]~
 @eprog
 This is the inverse function of \kbd{nfbasistoalg}.
