Looks like the comment sign in line 738 is the culprit: the code raises
an unconditional exception since the "if" has been commented out. If
true you could just remove the "#", see if it works, create a patch and
open a ticket for this.
I wonder why it works the first time, though...
Cheers,
Christian
On 03/01/2013 08:39 AM, Jan Groenewald 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 <http://www.aims.ac.za>
^^-^^
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