#12887: Optional args in Matrix_Mod submatrix method
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Reporter: dscharles | Owner: jason, was
Type: defect | Status:
positive_review
Priority: minor | Milestone: sage-5.1
Component: linear algebra | Resolution:
Keywords: matrix, finite field, submatrix | Work issues:
Report Upstream: N/A | Reviewers: Martin
Albrecht
Authors: David Sanchez Charles | Merged in:
Dependencies: | Stopgaps:
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Comment (by dscharles):
I'm sorry I didn't realized before, but it also was necessary to change
the output in order to work properly.
(Should I open another ticket?)
Before the last patch:
{{{
#!python
sage: A = matrix([[1,1],[2,2],[3,3]])
sage: B = matrix(Zmod(2), [[1,1],[2,2],[3,3]])
sage: A.submatrix(2,2)
[]
sage: A.submatrix(2,2).ncols()
0
sage: A.submatrix(2,2).nrows()
1
sage: B
[]
sage: B.submatrix(2,2).ncols()
0
sage: B.submatrix(2,2).nrows()
0
}}}
After the patch
{{{
#!python
sage: B.submatrix(2,2)
[]
sage: B.submatrix(2,2).ncols()
0
sage: B.submatrix(2,2).nrows()
1
}}}
With that done, the smith_form method worked with some (easy) examples.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12887#comment:5>
Sage <http://www.sagemath.org>
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