#11590: Integrating the sgn() function can produce incorrect results
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Reporter: mjo | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone:
Component: calculus | Keywords:
Work_issues: | Upstream: Reported upstream. Developers
acknowledge bug.
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by mjo):
Replying to [comment:5 kcrisman]:
> Well, I'm glad it wasn't just me!
>
> Could it be that because we get an answer without `abs_integrate` it
just returns the 'regular' answer? But I don't recall the integrate code
doing that, I think once we turn on `abs_integrate` it should just 'be
on'...
It's possible. The abs_integrate code looks like it defines extra definite
integration methods, and then loops through them until `'integrate` is
gone from the expression. Within maxima, the extra methods obviously get
tried first, because we get the right answer. But I suppose something in
the ECL integration could be trying the default definite integration
first.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11590#comment:6>
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