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.
