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