Hi, i would prefer to raise an error promoting the use of change_ring (same for matrices), which allows more tuning on the base ring.
By the way, note that the best approx with floating-point coefficients (e.g. for the sup norm on [-1,1]), is not necessarilly obtained with the best approx on each coefficients. Ciao, Thierry On Thu, May 30, 2019 at 11:38:45AM +0200, Vincent Delecroix wrote: > Dear devs, > > Is it fine if I implement numerical_approx on polynomials by calling > it recursively on coefficients? For example, we would have > > sage: x = polygen(QQ) > sage: p = 1343235439458/23 * x^2 - 234 / 143425*x + 1432/6512 > sage: p.numerical_approx() > 5.84015408460000e10*x^2 - 0.00163151472895241*x + 0.219901719901720 > > Right now, it does raise a TypeError (raised inside the generic > numerical_approx). > > It would fit with what we have for matrices > > sage: matrix(2, [11/23, -5/3, 132/7, 77/12]).n() > [0.478260869565217 -1.66666666666667] > [ 18.8571428571429 6.41666666666667] > > Best > Vincent > > -- > 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. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-devel/f75cfe1a-5856-03be-4940-aafd7a4812f5%40gmail.com. > For more options, visit https://groups.google.com/d/optout. -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/20190530103036.aa34rpw2xplrejei%40metelu.net. For more options, visit https://groups.google.com/d/optout.
