Alexander, All,
How is it going with your tensor implementation? I put together some
code to implement variance of tensors and uploaded it to github in my
tensor_contractions branch [0]. If you would like to build on that,
feel free to do so. If you have already made your own implementation,
please just choose whatever works best for your framework.
Here is how it works in the advertised branch:
>>> A = IndexedBase('A')
>>> i = VarIdx('i')
>>> A[i.up, i.down]
A[^i, _i]
>>> get_indices(A[i.up, i.down])
(set(), {})
>>> get_indices(A[i.up, j.down]*x[j.up])
(set([^i]), {})
Cheers,
Øyvind
[0]: https://github.com/jegerjensen/sympy/tree/tensor_contractions
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