#12280: Incorrect saturation of integer matrix
------------------------------+---------------------------------------------
Reporter: vbraun | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.8
Component: linear algebra | Keywords: saturation
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Changes (by vbraun):
* keywords: IML kernel 76 => saturation
* upstream: Not yet reported upstream; Will do shortly. => N/A
Comment:
I was off-track; IML computes the correct kernel but Sage then returns its
saturation. It turns out that computing the saturation introduces the
extra null vectors
{{{
sage: K = M._rational_kernel_iml().transpose(); K
70 x 76 dense matrix over Integer Ring (type 'print K.str()' to see all of
the entries)
sage: K.saturation()
76 x 76 dense matrix over Integer Ring
sage: K.saturation().row(71).is_zero()
True
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12280#comment:3>
Sage <http://www.sagemath.org>
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