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Deravites in 2D-axisymmetric models

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Hi guys,
I was wondering if we should add any extra parts for calculating the derivative of a variable in 2D-axisymmetric models? Under Definition ----Variables--If the goal is to define a new variable based on the derivative of the default variable like electric field (E), does this work or not?

new = d(es.Er , r )

Is this correct in axi-symmetric models ? our new variable is now the derivative of the E with respect to r?

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