On Saturday, 18 July 2015 08:31:07 UTC+1, Dima Pasechnik wrote: > > > > On Saturday, 18 July 2015 08:15:39 UTC+1, Ralf Stephan wrote: >> >> On Friday, July 17, 2015 at 11:01:52 AM UTC+2, Johannes Lippmann wrote: >>> >>> What should I do now? >>> >> >> If the (default) Maxima subroutine does not satisfy, always try SymPy: >> >> sage: integrate(x/(x^2+1),(x,0,infinity),algorithm='sympy') >> +Infinity >> >> Maxima when started without Sage says: >> >> (%i1) integrate(x/(x^2+1),x,0,+inf); >> defint: integral is divergent. >> >> so you found an error in Sage's interface to Maxima. >> > no, the bug is in the Maxima's version currently bundled with Sage (or in > its combination with the Lisp compiler ECL). > > $ sage --maxima > ;;; Loading #P"/home/dima/software/sage/local/lib/ecl/sb-bsd-sockets.fas" > ;;; Loading #P"/home/dima/software/sage/local/lib/ecl/sockets.fas" > ;;; Loading #P"/home/dima/software/sage/local/lib/ecl/defsystem.fas" > ;;; Loading #P"/home/dima/software/sage/local/lib/ecl/cmp.fas" > Maxima 5.35.1 http://maxima.sourceforge.net > using Lisp ECL 13.5.1 > 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) integrate(x/(x^2+1),x,0,+inf); > (%o1) 0 > (%i2) > > we should upgrade ECL and/or Maxima:
$ maxima ;;; Loading #P"/home/dima/lib/ecl-15.3.7/sb-bsd-sockets.fas" ;;; Loading #P"/home/dima/lib/ecl-15.3.7/sockets.fas" ;;; Loading #P"/home/dima/lib/ecl-15.3.7/defsystem.fas" ;;; Loading #P"/home/dima/lib/ecl-15.3.7/cmp.fas" Maxima branch_5_36_base_137_gdd4f836_dirty http://maxima.sourceforge.net using Lisp ECL 15.3.7 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) integrate(x/(x^2+1),x,0,+inf); defint: integral is divergent. -- an error. To debug this try: debugmode(true); (%i2) > > > -- 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 http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
