#13097: integral of ln(1+4/5*sin(x)) from -3.1415 to 3.1415 crashes Maxima and
Sage
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Reporter: kcrisman | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-5.1
Component: calculus | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies:
Stopgaps: |
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See extensive discussion at
Reported by Ben Jones:
{{{
sage: integrate(ln(1+4/5*sin(x)), x, -3.1415, 3.1415)
;;;
;;; Binding stack overflow.
;;; Jumping to the outermost toplevel prompt
;;;
...
;;;
;;; Binding stack overflow.
;;; Jumping to the outermost toplevel prompt
;;;
/Users/jonesbe/sage/sage-5.1.beta2/spkg/bin/sage: line 335: 86594 Illegal
instruction sage-ipython "$@" -i
}}}
There don't seem to be any problems with Maxima. Although it's been
traced down (thanks to Dan Drake) to 5.0.beta3, the only obvious candidate
for a change in our interface is when we added `abs_integrate`, which
doesn't seem to impact things.
{{{
(%i2) load(abs_integrate);
(%o2) /Users/.../sage-5.0/local/share/maxima/5.26.0/s\
hare/contrib/integration/abs_integrate.mac
(%i4) keepfloat:true;
(%o4) true
(%i7) integrate(ln(1+4/5*sin(x)), x, -3.1415, 3.1415);
3.1415
/
[ 4 sin(x)
(%o7) I ln(-------- + 1) dx
] 5
/
- 3.1415
}}}
And we have
{{{
sage: maxima_calculus(" integrate(ln(1+4/5*sin(x)), x, -3.1415, 3.1415);")
'integrate(ln(4*sin(x)/5+1),x,-3.1415,3.1415)
}}}
so something must indeed be wrong in how we're sending this to Maxima.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13097>
Sage <http://www.sagemath.org>
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