Greetings, everyone.
I am trying to use sympy calculate a perturbation problem, which looks
like:
<https://lh3.googleusercontent.com/-85X7sj42udw/VaE8SsgPpTI/AAAAAAAAAFs/4aHMDhFRZOY/s1600/per.png>
In sympy, I think it's safe to use code like:(all elements are
Matrices.)
i=Symbol("i",integer=True)
summation( (u.H*Hamil*p.col(i))*(p.col(i).H*Hamil*u) , (i,0,5))
However, it gives the error:
IndexError: Invalid index a[i]
I have calculated manually the sum, which gives the right result. SO,
I guess there is some misunderstanding about summation().
Any advises about solving this would be appreciated.
Thanks.
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