On Jun 10, 5:27 pm, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Tue, Jun 10, 2008 at 2:04 PM, mabshoff <[EMAIL PROTECTED]> wrote:
>
> > Riccardo Gori wrote:
> >> Hello,
>
> > Hi Riccardo,
>
> > I have also forwarded your email to sage-devel.
>
> >> In SAGE-3.0.2 with a Intel Mac OSX 10.5 I found the following bug:
>
> >> If I create a sympy matrix and if I try to access it it gives me an error.
> >> Step to reproduce:
>
> >> sage: import sympy
> >> sage: M = sympy.Matrix( (2,3) )
> >> sage: sympy.pprint M[0]
> >> Traceback (most recent call last):
> >> File "<stdin>", line 1, in <module>
> >> File
> >> "/Users/riccardo/.sage/sage_notebook/worksheets/admin/3/code/299.py", line
> >> 7, in <module>
> >> M[Integer(1)]
> >> File
> >> "/Applications/sage/local/lib/python2.5/site-packages/sympy/plotting/",
> >> line 1, in <module>
> >> File
> >> "/Applications/sage/local/lib/python2.5/site-packages/sympy/matrices/matrices.py",
> >> line 150, in __getitem__
> >> assert len(key) == 2
> >> TypeError: object of type 'sage.rings.integer.Integer' has no len()
> >> sage: sympy.pprint M[int(0)]
> >> 2
>
> > This is most likely an integration issue and I assume that if you use
> > Python ints the problem will go away. One aspect there is certainly
> > that Sympy is not integrated into Sage's coercion model.
Hi,
> This is a bug in Sympy:
we do not ship the latest Sympy release and some very similar sounding
issue was fixed in the last release, so maybe somebody should verify
that it is still broken in the latest release and then file a bug
report with Sympy. Otherwise we should upgrade Sympy in Sage to the
latest release.
> sage: import sympy
> sage: M = sympy.Matrix( (2,3) )
> sage: M
> [2]
> [3]
> sage: M[0]
> TypeError Traceback (most recent call last)
> ...
>
> Sympy *should* call the __index__ method on the input object
> in __getitem__, but it doesn't. The __index__ method is supported
> by Sage integers, and was added (by Travis Oliphant) in Python 2.5
> for exactly the above reason.
>
> I've cc'd this email to Ondrej Certik and hope he can post a bug
> report to the sympy bug tracker.
>
> -- William
Cheers,
Michael
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