#10543: Echelon form over QQ is mutable
------------------------------+---------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: defect | Status: positive_review
Priority: minor | Milestone: sage-4.6.2
Component: linear algebra | Keywords:
Author: Rob Beezer | Upstream: N/A
Reviewer: Tom Coates | Merged:
Work_issues: |
------------------------------+---------------------------------------------
Changes (by rbeezer):
* status: needs_work => positive_review
Old description:
> Which is not the norm for matrices over other rings.
>
> {{{
> sage: A=matrix(QQ,2,range(4))
> sage: B=matrix(ZZ,2,range(4))
> sage: C=A.echelon_form()
> sage: D=B.echelon_form()
> sage: C.is_mutable()
> True
> sage: D.is_mutable()
> False
> }}}
>
> See http://groups.google.com/group/sage-
> devel/browse_thread/thread/ef90d24da0ee704c
>
> Apply
>
> trac_10543-rational-echelon-form-immutable.patch, trac_10543-reviewer-
> rebased.patch
New description:
Which is not the norm for matrices over other rings.
{{{
sage: A=matrix(QQ,2,range(4))
sage: B=matrix(ZZ,2,range(4))
sage: C=A.echelon_form()
sage: D=B.echelon_form()
sage: C.is_mutable()
True
sage: D.is_mutable()
False
}}}
See http://groups.google.com/group/sage-
devel/browse_thread/thread/ef90d24da0ee704c
Apply
trac_10543-rational-echelon-form-immutable-v2.patch, trac_10543-reviewer-
rebased.patch
--
Comment:
Applied #10028 to 4.6.2.alpha3, only got one failure when applying the
first of the two patches here. Rebased that patch only, though the
failure seems trivial. All tests pass in sage/matrix2.
If this does not work, we'll go for alpha4.
Apply "v2" of original patch, then "reviewer-rebased," in that order.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10543#comment:8>
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