#10682: sum fails with lower bound != 0 or 1 (upgrade maxima to 5.26)
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Reporter: fmaltey | Owner:
burcin
Type: defect | Status:
needs_info
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 Pasechnik
Merged: | Dependencies:
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Comment(by jpflori):
Im currently looking at Maxima's code and am not yet convinced of what
changed in the last version.
There' indeed the possibility that an error get raised by Maxima (handler
... error stuff) if some values cannot be converted to floats float-or-
lose stuff).
In this case Maxima returns the partially evaluated expression.
But that does not explain why Maxima now returns (0,0,0,6) rather than the
old unevaluated expression for integrating x with a crazy expression. I'm
currently looking at dqags.lisp but did not find anything meaningful yet.
In particular, it also makes me wonder whether the message of the Sage
error (for the "workaround", but also for the earlier try/catch stuff) is
meaningful.
Will it ever be related to precision problems ? because Maxima seems not
to complain any more.
and as I said earlier, returning Error ourselves when when detect that the
last value of the tuple and as Nils proposes to do, seems a good idea to
me, but should be done later. I'd just like to actually reflect what
Maxima tells at the Sage level even though the end user still has to check
this last value for a moment.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10682#comment:64>
Sage <http://www.sagemath.org>
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