Thank you, Joseph,
  It could be nice to have this in tutorials.
In my case,  I still get a error
 Exception "unhandled kwant._common.UserCodeError"
Error occurred in user-supplied value function "hopping".

Although, my hoppings are pretty innocent  and conductance calculation works fine

On 18/10/18 17:04, Joseph Weston wrote:
currents = [J_0(p) for p in psi]

Thanks,

Sergey

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