Sorry, I don't understand your last sentence. We have sage: P = PolynomialRing(GF(2), "z", sparse=True); Q = PolynomialRing(ZZ, "z", sparse=False) sage: P.has_coerce_map_from(Q) False
How does this fit with "And of course you can convert even when Q is not sparse."? Martin On Wednesday, 12 October 2022 at 23:04:38 UTC+2 David Roe wrote: > Yes, that's expected. > > sage: P = PolynomialRing(GF(2), "z", sparse=True); Q = PolynomialRing(ZZ, > "z", sparse=True) > sage: P.has_coerce_map_from(Q) > True > > And of course you can convert even when Q is not sparse. > David > > On Wed, Oct 12, 2022 at 4:58 PM 'Martin R' via sage-devel < > sage-...@googlegroups.com> wrote: > >> I have no idea whether the following is to be expected: >> >> sage: P = PolynomialRing(GF(2), "z", sparse=False); Q = >> PolynomialRing(ZZ, "z") >> sage: P.has_coerce_map_from(Q) >> True >> >> sage: P = PolynomialRing(GF(2), "z", sparse=True); Q = >> PolynomialRing(ZZ, "z") >> sage: P.has_coerce_map_from(Q) >> False >> >> Martin >> >> -- >> 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+...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/sage-devel/c585103b-9dfa-4e25-b36b-20f8fb937435n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/sage-devel/c585103b-9dfa-4e25-b36b-20f8fb937435n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/5d443b30-3171-4a6c-bfdc-c61100680cc9n%40googlegroups.com.
