#16399: Matrix stack() should coerce to a common parent
-------------------------------------+-------------------------------------
Reporter: tscrim | Owner: tscrim
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.5
Component: linear algebra | Resolution:
Keywords: matrix stack | Merged in:
coercion | Reviewers:
Authors: Frédéric | Work issues:
Chapoton, Jeroen Demeyer | Commit:
Report Upstream: N/A | 810a889f723ae78ee0331cf366e22e2308ebf74e
Branch: | Stopgaps:
u/jdemeyer/ticket/16399 |
Dependencies: |
-------------------------------------+-------------------------------------
Changes (by jdemeyer):
* component: coercion => linear algebra
Old description:
> I feel like we shouldn't have to do an explicit ring change to do this.
> Plus we get (somewhat) different failures for dense versus sparse
> matrices:
> {{{
> sage: m = matrix([[1,2]])
> sage: m2 = matrix(QQ, [[1/2,2]])
> sage: m.stack(m2)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> ...
> TypeError: matrix has denominators so can't change to ZZ.
> }}}
> {{{
> sage: m = matrix([[1,2]], sparse=True)
> sage: m.stack(m2)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> ...
> TypeError: no conversion of this rational to integer
> }}}
New description:
I feel like we shouldn't have to do an explicit ring change to do this.
Plus we get (somewhat) different failures for dense versus sparse
matrices:
{{{
sage: m = matrix([[1,2]])
sage: m2 = matrix(QQ, [[1/2,2]])
sage: m.stack(m2)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
...
TypeError: matrix has denominators so can't change to ZZ.
}}}
{{{
sage: m = matrix([[1,2]], sparse=True)
sage: m.stack(m2)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
...
TypeError: no conversion of this rational to integer
}}}
Follow-up: #17595
--
--
Ticket URL: <http://trac.sagemath.org/ticket/16399#comment:18>
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