What to do with sparse(sparse(2),1) ?

[David Bateman]

Kim Hansen wrote:
> I am not really sure what the bug is here as the help in sparse seems
> to have a cut and paste error:
> =========================
> octave:4> help sparse
>  -- Loadable Function: S = sparse (A)
>      Create a sparse matrix from the full matrix A.  is forced back to
>      a full matrix is resulting matrix is sparse
>
>  -- Loadable Function: S = sparse (A, 1)
>      Create a sparse matrix and convert it back to a full matrix.  is
>      forced back to a full matrix is resulting matrix is sparse
> =========================
>
> The problem I saw was that these two results were different:
> =========================
> octave:1> sparse(2,1)
> ans =
>
> Compressed Column Sparse (rows = 2, cols = 1, nnz = 0)
>
>
> octave:2> sparse(sparse(2),1)
> ans = Compressed Column Sparse (rows = 1, cols = 1, nnz = 1)
>
>   (1, 1) ->  2
> octave:3>
>   
If you want to address this one then the attached patch should do it.

D.

-- 
David Bateman                                David.Bateman at motorola.com
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Parc Les Algorithmes, Commune de St Aubin    +33 6 72 01 06 33 (Mob) 
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