Well according to the pull request
https://github.com/sympy/sympy/pull/2152 there are some bugs.
Definitely there were a lot of bugs before, mostly because it wasn't
(and still isn't) very heavily used.
Aaron Meurer
On Mon, Jun 3, 2013 at 7:11 PM, Chris Smith <smi...@gmail.com> wrote:
> Yes, the callable could create only a few non-zero entries. And only the
> non-zero entries are retained in the SparseMatrix so it is reasonable to
> keep that code:
>
>>>> SparseMatrix(3,3,lambda i,j: 1 if i==j else 0)
> [1, 0, 0]
> [0, 1, 0]
> [0, 0, 1]
>>>> _._smat
> {(0, 0): 1, (1, 1): 1, (2, 2): 1}
>
> Again, the "else" part allows dense input that has few entries to be stored
> in a compact way so there's no reason to disallow it AFAICT:
>
>>>> SparseMatrix([[0,0,1],[0,0,1]])
> [0, 0, 1]
> [0, 0, 1]
>>>> _._smat
> {(1, 2): 1, (0, 2): 1}
>>>> SparseMatrix(3,3,lambda i,j: 1 if i==j else 0)
>
> (The bugginess that Aaron refers to is perhaps refering to the former state
> of SparseMatrix; I think things are currently in pretty good shape.)
>
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