Well, now I am having trouble reproducing the problem I had. I was getting:
In [23]: M(i, j, n).args
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
/Users/aaronmeurer/Documents/Python/sympy/sympy/<ipython console> in <module>()
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/tensor/indexed.pyc in
__call__(self, *indices, **kw_args)
121
122 def __call__(self, *indices, **kw_args):
--> 123 return IndexedElement(self, *indices, **kw_args)
124
125 @property
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/tensor/indexed.pyc in
__new__(cls, stem, *args, **kw_args)
154
155 # FIXME: 2.4 compatibility
--> 156 args = map(_ensure_Idx, args)
157 # args = tuple([ a if isinstance(a, Idx) else Idx(a) for a in
args ])
158 return Expr.__new__(cls, stem, *args, **kw_args)
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/tensor/indexed.pyc in
_ensure_Idx(arg)
135 return arg
136 else:
--> 137 return Idx(arg)
138
139 class IndexedElement(Expr):
/Users/aaronmeurer/Documents/Python/sympy/sympy/sympy/tensor/indexed.pyc in
__new__(cls, label, range, **kw_args)
235
236 if not label.is_integer:
--> 237 raise TypeError("Idx object requires an integer label")
238
239 elif isinstance(range, (tuple, list, Tuple)):
TypeError: Idx object requires an integer label
But now I just get
In [21]: M(i, j, n).args
Out[21]: (M, i, j, n)
By the way, shouldn't it be just (i, j, n), like Function does?
In [20]: f(x, y).args
Out[20]: (x, y)
But anyway, now that it works, I think I can get somewhere.
Aaron Meurer
On Sep 19, 2010, at 11:20 AM, Aaron S. Meurer wrote:
> So given Chris's tip in issue 2058 (which flew over my head the first time
> for some reason), I think I might have this figured out, except for one
> thing. Given M(i, j, n), how to I get the third argument, n? I tried M(i,
> j, n)[2] and M(i, j, n).args, but neither works.
>
> Aaron Meurer
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