Go to the first, previous, next, last section, table of contents.

### `setmod_ff`

`setmod_ff([prime|poly])`
  :: Sets/Gets the current base fields.

return
  number or polynomial
prime
  prime
poly
  univariate polynomial irreducible over GF(2)

- If the argument is a non-negative integer prime, GF(prime) is set as the current base field.
- If the argument is a polynomial poly, GF(2^deg(poly mod 2)) = GF(2)[t]/(poly(t) mod2) is set as the current base field.
- If no argument is specified, the modulus indicating the current base field is returned. If the current base field is GF(prime), prime is returned. If it is GF(2^n), the defining polynomial is returned.
- Any irreducible univariate polynomial over GF(2) is available to set GF(2^n). However the use of `defpoly_mod2()` is recommended for efficiency.

    [174] defpoly_mod2(100);
    x^100+x^15+1
    [175] setmod_ff(@@);
    x^100+x^15+1
    [176] setmod_ff();
    x^100+x^15+1

`References`
  section `defpoly_mod2`

Go to the first, previous, next, last section, table of contents.