#10682: sum fails with lower bound != 0 or 1 (upgrade maxima to 5.26)
---------------------------------------------------------+------------------
Reporter: fmaltey | Owner:
burcin
Type: defect | Status:
needs_work
Priority: critical | Milestone:
sage-5.0
Component: symbolics | Keywords:
maxima 5.26.0 binomial sum
Work_issues: domain issue, error handling in nintegral | Upstream: N/A
Reviewer: Jean-Pierre Flori, | Author:
Dima Pasechnick
Merged: | Dependencies:
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Comment(by nbruin):
Replying to [comment:43 jpflori]:
> And the error handling at the end of nintegral should definitely be
reworked.
>
> For example the test "if 'quad_qags' in str(v)" is useless now that
Maxima behavior has changed.
>
> Moreover, I'm not sure the "ERROR in srt(err)" can ever be reached now
(was it before???).
>
> I could not locate the commit corresponding to this change although I
tried a little hard. Maxima source tree is a little obscure for me. This
commit should be mentionned in the doc and would help to answer the two
above remarks about error handling. Some expert of Maxima is needed for
that.
I did find
[http://maxima.git.sourceforge.net/git/gitweb.cgi?p=maxima/maxima;a=commitdiff;h=df7393f0f2433cd60937e42b7cae624add3ca085
this commit] in the history of `src/numerical/slatec/quadpack.lisp`. It
seems to indicate that something about quadpack error reporting has
changed and may have become more configurable. Perhaps we can configure it
in a way that the reported errors are more suitable and detectable for us?
desolve: I think Dima's new approach is acceptable in that it both fixes
the doctest and documents the regression. Did anybody ever check if the
returned solution with `domain: complex` is actually correct with some
crazy combination of branch cut choices?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10682#comment:45>
Sage <http://www.sagemath.org>
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