IndexError: Invalid index a[i] error

[万博]

Greetings, everyone.

     I am trying to use sympy calculate a perturbation problem, which looks like:

     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.

[Aaron Meurer]

This looks like a bug in SymPy. Can you paste the full traceback?

Aaron Meurer

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