Hi The maxima part should probably be:
0 jan@muizenberg:/srv/local/Disk_Space/sage-5.7$ maxima # system maxima 5.24 Maxima 5.24.0 http://maxima.sourceforge.net using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (a.k.a. GCL) 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) defint(exp(-abs(x))/cosh(x),x,minf,inf); (%o1) 2 log(2) (%i2) defint(exp(-abs(x))/cosh(x),x,minf,inf); (%o2) 2 log(2) Or the maxima from sage (%i2) 0 jan@muizenberg:/srv/local/Disk_Space/sage-5.7$sage --maxima # sage maxima 5.29.1 ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/sb-bsd-sockets.fas" ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/sockets.fas" ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/defsystem.fas" ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/cmp.fas" Maxima 5.29.1 http://maxima.sourceforge.net using Lisp ECL 12.12.1 Distributed under the GNU Public License. See the file COPYING. Dedicated to the memory of William Schelter. The function bug_report() provides bug reporting information. (%i1) defint(exp(-abs(x))/cosh(x),x,minf,inf); (%o1) 2 log(2) (%i2) defint(exp(-abs(x))/cosh(x),x,minf,inf); (%o2) 2 log(2) (%i3) Both seem to work fine. Regards, Jan On 1 March 2013 09:39, Jan Groenewald <j...@aims.ac.za> wrote: > Sage 5.7 on Ubuntu 12.04.2 > > sage: > integral(e^(-abs(x))/cosh(x),x,-infinity,infinity) > > 2*log(2) > sage: integral(e^(-abs(x))/cosh(x),x,-infinity,infinity) > --------------------------------------------------------------------------- > ValueError Traceback (most recent call last) > ... > <snip> > ... > /usr/lib/sagemath/local/lib/python2.7/site-packages/sage/interfaces/maxima_lib.pyc > in sr_integral(self, *args) > 737 # in pexpect interface, one looks for this - e.g. > integrate(1/x^3,x,-1,3) gives a principal value > 738 # if "divergent" in s or 'Principal Value' in s: > --> 739 raise ValueError, "Integral is divergent." > 740 elif "Is" in s: # Maxima asked for a condition > 741 j = s.find('Is ') > > ValueError: Integral is divergent. > sage: > > It runs fine in maxima repeatedly... > > 0 jan@muizenberg:/var/autofs/misc/home/jan$sage --maxima > ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/sb-bsd-sockets.fas" > ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/sockets.fas" > ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/defsystem.fas" > ;;; Loading #P"/usr/lib/sagemath/local/lib/ecl/cmp.fas" > Maxima 5.29.1 http://maxima.sourceforge.net > using Lisp ECL 12.12.1 > 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) integral(e^(-abs(x))/cosh(x),x,-infinity,infinity); > 1 > (%o1) integral(---------------, x, - infinity, infinity) > abs(x) > e cosh(x) > (%i2) integral(e^(-abs(x))/cosh(x),x,-infinity,infinity); > 1 > (%o2) integral(---------------, x, - infinity, infinity) > abs(x) > e cosh(x) > (%i3) > > Regards, > Jan > -- > .~. > /V\ Jan Groenewald > /( )\ www.aims.ac.za > ^^-^^ > -- .~. /V\ Jan Groenewald /( )\ www.aims.ac.za ^^-^^ -- 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 http://groups.google.com/group/sage-devel?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
