I have a system with 3 variables, representing the x,y,z component of a quantity. I solved this system to obtain the component wise distribution in a given domain. I would now like to calculate the divergence of this distribution at the node points and then output this along with the previous 3 variables. How do I compute the divergence at the node points? I could only find routines for derivatives of the shape functions at the quadrature points.
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