Hi all, Consider the following sequence of constructions:
sage: R = PolynomialRing(ZZ, ['x1', 'x2', 'x3']) sage: S = PolynomialRing(R, ['x4']) sage: T = S.extend_variables(['x5', 'x6']) sage: type(R) <type 'sage.rings.polynomial.multi_polynomial_libsingular.MPolynomialRing_libsingular'> sage: type(S) <class 'sage.rings.polynomial.polynomial_ring.PolynomialRing_integral_domain_with_category'> sage: type(T) <class 'sage.rings.polynomial.multi_polynomial_ring.MPolynomialRing_polydict_with_category'> What I'd like: extend R with a few extra variables. I also have a matrix over R that I'd like to interpret as a matrix over R-with-a-few-extra-variables. What I get: only the ring S has the method extend_variables. Neither R nor T have it. Why is that? What's the proper way to extend R? Cheers, Stefan. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
