Comment #11 on issue 2020 by [email protected]: Symbols & Matrices
http://code.google.com/p/sympy/issues/detail?id=2020
I really like the Indexed class, and I will have a look at the _op_priority
feature.
What is the general opinion on allowing Symbol/Indexed to interact with
Matrix, i.e.
a-sympy.Matrix([c,0,0])
where a is a Symbol or an IndexedBase and c is a Symbol.
Moreover, it would help a lot if subs could work with matrices, i.e.
(a+b).subs({a:sympy.Matrix([c,0,0])})
In both cases an exception 'unsupported operand types'
or 'NotImplementedError(Matrix Support)' is thrown respectively.
This is also the main difference to issue 1860.
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