#16511: Fix solve_right for matrices over IntegerModRing
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Reporter: pbruin | Owner:
Type: defect | Status: new
Priority: minor | Milestone: sage-6.3
Component: linear | Keywords: matrix integer_mod
algebra | solve_right
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Here are two bugs in `Matrix.solve_right()`:
{{{
sage: A = Matrix.identity(2)
sage: B = Matrix.identity(Zmod(8), 2)
sage: B.solve_right(A)
...
AttributeError: 'sage.rings.integer_ring.IntegerRing_class' object has no
attribute 'cover_ring'
sage: B.solve_right(B)
...
PariError: syntax error, unexpected ')', expecting )-> or ',': (1,0)
}}}
In the first case, there is no solution due to the different base rings;
we should at least return a more informative error message. In the second
case, `B` itself is the unique solution.
--
Ticket URL: <http://trac.sagemath.org/ticket/16511>
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