#16643: integrate() problem
-------------------------------------+-------------------------------------
Reporter: rws | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-
Component: symbolics | duplicate/invalid/wontfix
Keywords: integration, | Resolution:
maxima | Merged in:
Authors: | Reviewers: Peter Bruin
Report Upstream: Fixed upstream, | Work issues:
but not in a stable release. | Commit:
Branch: | Stopgaps:
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by pbruin):
* status: new => needs_review
* reviewer: => Peter Bruin
* milestone: sage-6.4 => sage-duplicate/invalid/wontfix
Comment:
With Maxima 5.34.1 and also with 5.35.1 (see #17514), both integrals are
returned unevaluated:
{{{
sage: f = diff((tan(x) + x) * e^tan(x), x)
sage: %time integrate(f, x)
CPU times: user 5min 32s, sys: 12 ms, total: 5min 32s
Wall time: 5min 33s
integrate((tan(x)^2 + 1)*(x + tan(x))*e^tan(x) + (tan(x)^2 + 2)*e^tan(x),
x)
sage: g = e^tan(x) * sec(x)^2 * (tan(x) + x) + e^tan(x) * (sec(x)^2 + 1)
sage: %time integrate(g,x)
CPU times: user 4min 43s, sys: 128 ms, total: 4min 44s
Wall time: 4min 44s
integrate((x + tan(x))*e^tan(x)*sec(x)^2 + (sec(x)^2 + 1)*e^tan(x), x)
}}}
I propose to close this since the ECL error appears to have been fixed
upstream and the example takes too long to be a sensible doctest.
--
Ticket URL: <http://trac.sagemath.org/ticket/16643#comment:10>
Sage <http://www.sagemath.org>
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