#9880: Segfault in PyNaC 0.2.0.p4
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Reporter: jpflori | Owner: burcin
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: symbolics | Keywords: pynac
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by jpflori):
I guess there are two main parts in this ticket, I did not have a look for
a long time, so all this should be taken carefully :
- Burcin patch which (more or less) revert the internal ordering in Pynac
to the original one in Ginac and create new methods to use a different
order for printing. We could maybe only apply the part reverting the
internal order to Ginac original one to get the bug solved and close this
ticket.
- However, it is not a solution to use Ginac order for printing because it
is quite random and unpredictable, it depends on variable order creation
among others. That's the reason for the different order for printing (and
getting operands and so on). It was not quite coherent, whence my patch to
make it a little better. We could merge that in a second ticket. By the
way, the order implemented right now should be more or less degrevlex.
- With that new framework, we could also quite easily allow the use of
different orders for manipulating (ie printing, getting operands...)
symbolic expressions in Sage (Burcin already mentionned that somewhere on
the Web IIRC).
- I think there is still work to do regarding expressions manipulation
(see #9989)
- I don't really have an idea of what could get misprinted with Burcin+my
patch applied. You could try multivariate polynomials to check it follows
degrevlex, then such expressions times exponentials and let me know what
you feel.[[BR]]
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9880#comment:10>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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