That worked. On Oct 23, 7:41 pm, John H Palmieri <jhpalmier...@gmail.com> wrote: > On Oct 23, 7:20 pm, Cary Cherng <cche...@gmail.com> wrote: > > > R.<g17,g19,g27,g28,g38,g39,g47,g49,g57,g58,g68,g69> = > > PolynomialRing(QQ) > > > Eventually I compute a polynomial p with something like > > > p = p1 / q.determinant() > > > Sage gives p with type fraction field. How do I cast p back to the > > polynomial ring so I can call degree() on it? > > Does R(p) give what you want? > > sage: R.<g17,g19> = PolynomialRing(QQ) > sage: R.inject_variables() > Defining g17, g19 > sage: p = (g17^2 - g19^2)/(g17 + g19) > sage: type(p) > <type 'sage.rings.fraction_field_element.FractionFieldElement'> > sage: type(R(p)) > <type > 'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomial_libsingular '> > > -- > John
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