#6904: change ring broken over QQ and GF(2)
------------------------------+---------------------------------------------
Reporter: was | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.5
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------------+---------------------------------------------
Comment(by was):
Amazingly, this is still broken in Sage-4.5.alpha4!
{{{
wst...@sage:~/build/sage-4.5.alpha4$ ./sage
----------------------------------------------------------------------
| Sage Version 4.5.alpha4, Release Date: 2010-07-06 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
**********************************************************************
* *
* Warning: this is a prerelease version, and it may be unstable. *
* *
**********************************************************************
sage: matrix(QQ,2,[1,0,0,1]).change_ring(GF(2)) - 1
---------------------------------------------------------------------------
RuntimeError Traceback (most recent call
last)
/mnt/usb1/scratch/wstein/build/sage-4.5.alpha4/<ipython console> in
<module>()
/mnt/usb1/scratch/wstein/build/sage-4.5.alpha4/local/lib/python2.6/site-
packages/sage/structure/element.so in
sage.structure.element.RingElement.__sub__
(sage/structure/element.c:11073)()
/mnt/usb1/scratch/wstein/build/sage-4.5.alpha4/local/lib/python2.6/site-
packages/sage/structure/coerce.so in
sage.structure.coerce.CoercionModel_cache_maps.bin_op
(sage/structure/coerce.c:6123)()
/mnt/usb1/scratch/wstein/build/sage-4.5.alpha4/local/lib/python2.6/site-
packages/sage/structure/element.so in
sage.structure.element.RingElement.__sub__
(sage/structure/element.c:11005)()
RuntimeError:
sage:
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6904#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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