#12280: Incorrect saturation of integer matrix
------------------------------+---------------------------------------------
Reporter: vbraun | Owner: jason, was
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-5.0
Component: linear algebra | Keywords: hnf echelon_form
Work_issues: | Upstream: None of the above - read trac
for reasoning.
Reviewer: | Author: Volker Braun
Merged: | Dependencies:
------------------------------+---------------------------------------------
Changes (by newvalueoldvalue):
* priority: major => critical
* status: new => needs_review
* upstream: N/A => None of the above - read trac for reasoning.
* author: => Volker Braun
Comment:
The actual cause is that there was a fallback to pari in case of an ill-
conditioned matrix (which this one turns out to be), but we did not pass
`include_zero_rows=False` in this case. This is fixed in the patch.
While adding doctests, I noted that pari with `flag=4,
include_zero_rows=False` also gives an incorrect result. The patch also
disables this combination, the follow-up ticket #12346 will deal with this
and re-enable it once this issue is fixed upstream.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12280#comment:5>
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