#12123: Bug in convolution
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Reporter: kcrisman | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: calculus | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:4 kcrisman]:
> [http://math.stackexchange.com/questions/362055 Here's another report]
that is almost certainly the same thing.
The two curve parts before addition look like this
[[Image(http://s18.postimg.org/uptxg06pl/tmp_hd_MODX.png, 300px)]]
A working implementation should make sure that, when they are added, only
three intervals remain.
{{{
sage: f = Piecewise([[(0, 1), -1/2*x^2 + x],[(1, 2), 1/2],[(2, 3), 1/2*x^2
- 3*x + 9/2]])
sage: g = Piecewise([[(-1, 0), 1/2*x^2 + x + 1/2],[(0, 1), 1/2],[(1, 2),
-1/2*x^2 + x]])sage: f+g
Piecewise defined function with 4 parts, [[(-1, 0), 1/2*x^2 + x + 1/2],
[(0, 1), -1/2*x^2 + x + 1/2], [(1, 2), -1/2*x^2 + x + 1/2], [(2, 3),
1/2*x^2 - 3*x + 9/2]]
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/12123#comment:10>
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