This is unrelated to the previous question about matrix expressions.
How can I do the following
>>> p = MatrixSymbol('p', 2, 1)
>>> p[0].subs(p, Matrix([5, 6]))
5
>>> p[x].subs(p, Matrix([5, 6])).subs(x, 0)
5
The first one is more important for me than the second one.
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