Slicing in sparse

[John W. Eaton]

On  4-Dec-2007, Kim Hansen wrote:

| I don't really care about what the matrices do when expanded with a
| single index, but I think full and sparse should do the same in all
| instances where they are expanded with two indices.
| 
| The only case where my test fails now is:
| 
| octave:20> x=sparse(ones(2)), x([],:)=2
| x =
| 
| Compressed Column Sparse (rows = 2, cols = 2, nnz = 4)
| 
|   (1, 1) ->  1
|   (2, 1) ->  1
|   (1, 2) ->  1
|   (2, 2) ->  1
| 
| x =
| 
| Compressed Column Sparse (rows = 2, cols = 2, nnz = 0)
| 
| 
| octave:21>

Please try the following patch.  Note that while looking at this, I
think I found another inconsistency in Matlab's behavior (see the
comment in the patch).

Thanks,

jwe


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