#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 Pasechnick
Merged: | Dependencies:
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Comment(by dimpase):
Replying to [comment:43 jpflori]:
> I would rather follow Nils approach and at least include a try/finally
statement in cas an error is raised.
>
> Doing so, we're sure not to let the domain set to real after leaving the
function because of an error.
>
> Then, you'd better use "P" already present in the code rather than
sage.calculus.calculs.maxima so that you're sure to use the same maxima as
the one that will be used for solving the equation. Currently it's
equivalent, but if something else changes in the future, such a choice
will make everything easier.
I really cannot imagine a scenario when one would run several instances of
maxima in a totally uncoordinated way. If such a major change was ever to
happen, surely a facility to execute a series of maxima commands in a
given maxima instance would be available, and could be used then.
>
> Finally, on my side, I'd really prefer first to use the option approach
you already implemented, and then to bakup the previous value of domain
and set it back in the finally statement (rather than setting it to
complex all the time).*
That's a good point, regardless. As I said, when working on the previous
patch I overlooked a way to set domain by another call to maxima.
[...]
> A last question is to know what we do when nintegral returns an error
code.
>
> Do we let the situation as is? Or do we raise an error. I would agrre
that this should be treated in another ticket, but I also don't think
there is a better choice to make. Some discussion should happen.
It surely can be handled better, but it surely should happen on another
ticket.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10682#comment:52>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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