#17468: Strange integration error/hang with log(abs(sin(x)))
-------------------------------------------------+-------------------------
Reporter: kcrisman | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.5
Component: calculus | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: Fixed upstream, but not in a | Work issues:
stable release. | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by pbruin):
Also, with the latest Git version of Maxima (and using GCL) the error has
disappeared and there is just an "encountered log(0)" message:
{{{
Maxima branch_5_35_base_16_gfc3f8b9_dirty http://maxima.sourceforge.net
using Lisp GNU Common Lisp (GCL) GCL 2.6.12 (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) integrate(log(abs(2*sin(u))),u,0,%pi/3);
sqrt(3) %i + 1 sqrt(3) %i + 1
(%o1) (18 %i li (--------------) + 18 %i li (- --------------) - 3 %pi
log(3)
2 2 2 2
2
2 %pi log(3) %i
%pi
+ 2 %i %pi )/18 + ---------- -
-------
6
12
(%i2) load(abs_integrate);
(%o2) /home/bruinpj/src/maxima/share/contrib/integration/abs_integrate.mac
(%i3) integrate(log(abs(2*sin(u))),u,0,%pi/3);
log: encountered log(0).
sqrt(3) %i + 1 sqrt(3) %i + 1
(%o3) (18 %i li (--------------) + 18 %i li (- --------------) - 3 %pi
log(3)
2 2 2 2
2
2 %pi log(3) %i
%pi
+ 2 %i %pi )/18 + ---------- -
-------
6
12
}}}
I guess the reason for the errors in comment:5 and comment:7 was that
http://sourceforge.net/p/maxima/bugs/2853/ was only fixed after Maxima
5.35.1 was released.
--
Ticket URL: <http://trac.sagemath.org/ticket/17468#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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