Hi all, I'm trying to solve a simple Laplace equation with FEMsystem based on introduction_ex3.C and fem_system_ex1.C (It seems easy to expand a steady model to a transient model with FEMsystem). One thing I cannot figure out is how to add the element matrix and RHS with FEMsystem. Do I need to override element_time_derivative or assembly? I'd appreciate if someone could briefly describe necessary steps.
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