#19312: Update to pynac-0.5.0
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Reporter: rws | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.10
Component: packages: | Resolution:
standard | Merged in:
Keywords: | Reviewers:
Authors: Ralf Stephan | Work issues:
Report Upstream: N/A | Commit:
Branch: u/rws/19312-2 | 76733e4c003da3506ac1cc15bea61b7ca147de93
Dependencies: #19606 | Stopgaps:
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Comment (by rws):
Replying to [comment:44 tscrim]:
> Replying to [comment:42 rws]:
> > Well you can't give a transform of a noninvertible matrix, so I
changed the example to one that is always invertible. I can revert to the
original doctest but it will lead to problems in a later ticket.
>
> Unless `a*d - b*c == 0`, then this is an invertible matrix, and this is
a "rare" event for generic `a,b,c,d`. So I would say this is a safe test,
or perhaps we can add an assumption that `a*d - b*c != 0`? Also could you
tell me what ticket you are referring to or give some more details?
If I remember correctly there was a problem due to the
`Expression.__nonzero__` changes in the first branch. So this might
resurface with #19040. I'm sorry I can't give more details, let's just see
about it whenever #19040 gets tackled.
--
Ticket URL: <http://trac.sagemath.org/ticket/19312#comment:45>
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