#17663: clean sparse matrices
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       Reporter:         |        Owner:
  vdelecroix             |       Status:  needs_review
           Type:         |    Milestone:  sage-6.5
  enhancement            |   Resolution:
       Priority:  major  |    Merged in:
      Component:         |    Reviewers:  Martin von Gagern
  linear algebra         |  Work issues:
       Keywords:         |       Commit:
        Authors:         |  d6302e4ce044a95a78f7c1437d712c9ee0c870a1
  Vincent Delecroix      |     Stopgaps:
Report Upstream:  N/A    |
         Branch:         |
  public/17663           |
   Dependencies:         |
  #17658                 |
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Changes (by vdelecroix):

 * status:  needs_work => needs_review


Comment:

 Replying to [comment:8 gagern]:

 Very strange. Actually, when you try to convert matrix from a ring to
 another you might end up to call the constructor of `MatrixGenericSparse`
 with arguments `entries=[]`. And so, the case of the empty list needs to
 be treated!! I added a long comment in the constructor and it might be
 appropriate to actually modify the code in `MatrixSpace.matrix`.

 Replying to [comment:9 jhpalmieri]

 True. I added two sentences in a `.. NOTE::`. Actually, I have no idea
 about the potential speed up.

 Vincent

--
Ticket URL: <http://trac.sagemath.org/ticket/17663#comment:11>
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