#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 nbruin):
Replying to [comment:68 jpflori]:
> Yup but that won't be because of too high precision and that's what our
error message says...
>
> So let's just remove the "to that precision" part.
Yes, you're right. Agreed. In fact, I expect that any precision problems
will always be reported via the error code, so they will *never* come out
as an error or an unevaluated call. This only happened before because
fortan's "STOP" raised an error, which it doesn't do now anymore.
That also makes me think that the body should be
{{{
v = ex._maxima_().quad_qags(x, a, b,
epsrel=desired_relative_error,
limit=maximum_num_subintervals)
#If an error gets raised during evaluation, maxima just returns the
unevaluated expression
#we raise an error instead
if 'quad_qags' in str(v):
raise ValueError, "Maxima (via quadpack) cannot compute the
integral"
return float(v[0]), float(v[1]), Integer(v[2]), Integer(v[3])
}}}
i.e., just let `quad_qags` raise its own errors instead of masking it with
a blanket error message. Presently we are not aware of any error that
would get raised under normal operation in there anyway, so we would want
to know what went wrong.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10682#comment:70>
Sage <http://www.sagemath.org>
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