#8286: sparse_rows and sparse_columns are broken for 0xn, nx0 matrices
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Reporter: jhpalmieri | Owner: was
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.3
Component: linear algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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{{{
sage: mat = matrix(ZZ, 0, 1, sparse=True)
sage: mat.nrows()
0
sage: mat.rows()
[(0)]
sage: mat = matrix(ZZ, 0, 1, sparse=False)
sage: mat.nrows()
0
sage: mat.rows()
[]
}}}
The {{{rows}}} method should act the same regardless of the sparsity of
the matrix, and when there are no rows, it should return an empty list.
The same thing happens with matrices defined over QQ or GF(2), so I'm
guessing that the problem is with {{{sparse_rows}}} and
{{{sparse_columns}}} in sage/matrix/matrix1.pyx.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8286>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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