Hello all, I am trying to identify the boundary DoFs associated with my problem - by identify I mean finding out their indices in the global solution vector. For example, in step-12 (advection with DG) we have fixed boundary conditions on the inflow boundary. I would like to find out what entries of the solution vector correspond to those boundary values. In my inverse problem setup I am using the solution values as my control variables, and I would like to either
*tell the optimizer which values are fixed and cannot be changed by the line search or other procedure *exclude the boundary values from my set of control variables since they cannot be changed by the optimizer anyway. My guess is the 1st option would be best, since I can easily set bound constraints on my optimization variables. Thank you! -- Mihai
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