I think Dima very very confusingly actually agreed that this is a bug in maxima that is in the newest version.
I think your options are: - use the sympy option, or - fix the bug in maxima, or - change what sage uses by default, or - wait On Sun, Jan 22, 2017 at 12:49 PM Peleg Michaeli <freepe...@gmail.com> wrote: > So... I couldn't really follow: should I open a new ticket, or should it > be solved by integrating the new maxima? > > > On Sunday, 22 January 2017 19:37:50 UTC+2, Dima Pasechnik wrote: > > > > On Sunday, January 22, 2017 at 4:13:53 PM UTC, William wrote: > > On Sun, Jan 22, 2017 at 7:14 AM, Peleg Michaeli <free...@gmail.com> wrote: > > > > Hi, > > > > > > > > sage: ((2^(2*x+1)+(2^x*x^100)^(3/2))/(4^x-100*2^x)).limit(x=infinity) > > > > -Infinity > > > > > > > > This is a wrong answer. It should be 2. > > > > > > > > Replacing 3/2 in the power by 1, 2, or 3 (at least) gives correct answers > > > > (2, inf, inf). Replacing it by 5/2 given a wrong answer again. > > > > > > > > Is this related to a known bug? > > > > > > I don't know if it is known - - you can try searching > > > https://trac.sagemath.org/, which lists all bugs we know of. > > > > > > This is actually a bug in **MAXIMA**, which Sage calls to do this > > > limit: http://maxima.sourceforge.net/ > > > > no, it's not in Maxima 5.39.0 (see https://trac.sagemath.org/ticket/18920 > and give it a positive review :-)) > called with its default settings. > > $ sage --maxima > ;;; Loading #P"/home/dima/Sage/sage-dev/local/lib/ecl/sb-bsd-sockets.fas" > ;;; Loading #P"/home/dima/Sage/sage-dev/local/lib/ecl/sockets.fas" > ;;; Loading #P"/home/dima/Sage/sage-dev/local/lib/ecl/defsystem.fas" > ;;; Loading #P"/home/dima/Sage/sage-dev/local/lib/ecl/cmp.fas" > Maxima 5.39.0 http://maxima.sourceforge.net > using Lisp ECL 16.1.2 > Distributed under the GNU Public License. See the file COPYING. > Dedicated to the memory of William Schelter. > The function bug_report() provides bug reporting information. > (%i1) limit((2^(2*x+1)+(2^x*x^100)^(3/2))/(4^x-100*2^x),x,inf); > (%o1) 2 > > Although calling this version of Maxima as > sage: ((2^(2*x+1)+(2^x*x^100)^(3/2))/(4^x-100*2^x)).limit(x=infinity) > > gives -Infinity, still, as it's not called with default settings, but with > something > that breaks it sometimes. > > > > > If you call sympy instead it gets the right answer: > > > > > > sage: ((2^(2*x+1)+(2^x*x^100)^(3/2))/(4^x-100*2^x)).limit(x=infinity, > > > algorithm="sympy") > > > 2 > > > > > > sage: ((2^(2*x+1)+(2^x*x^100)^(3/2))/(4^x-100*2^x)).limit(x=infinity, > > > algorithm="maxima_taylor") > > > -Infinity > > > > > > sage: ((2^(2*x+1)+(2^x*x^100)^(3/2))/(4^x-100*2^x)).limit(x=infinity, > > > algorithm="maxima") > > > -Infinity > > > > > > > > > > > > > > > > > > > > > Thanks, > > > > Peleg. > > > > > > > > -- > > > > You received this message because you are subscribed to the Google Groups > > > > "sage-support" group. > > > > To unsubscribe from this group and stop receiving emails from it, send an > > > > email to sage-support...@googlegroups.com. > > > > To post to this group, send email to sage-s...@googlegroups.com. > > > > Visit this group at https://groups.google.com/group/sage-support. > > > > For more options, visit https://groups.google.com/d/optout. > > > > > > > > > > > > -- > > > William (http://wstein.org) > > > > > > > > > > > -- > > > You received this message because you are subscribed to the Google Groups > "sage-support" group. > > > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-support+unsubscr...@googlegroups.com. > > > To post to this group, send email to sage-support@googlegroups.com. > > > Visit this group at https://groups.google.com/group/sage-support. > > > For more options, visit https://groups.google.com/d/optout. > > > -- Sent from my massive iPhone 6 plus. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
