Hi everybody I want to change to a 64 bit system so I would like to know if there is any special requirement that I need to consider so that I can be able to use deal.II on the new system?I want to ask as well about the following issue: I am trying to solve a 3d coupled flow problem and in order to collect the pressure mass matrix to use as a preconditioner for the schur complement I use a different fe object and dof_handler object that descibe only trilinear approximations, than I do in order to describe the actual system.I do that because as far as I understand if I use the objects that describe the actual system I will have to allocate memory for the viscous-reaction terms that I do not use for the preconditioner. I could do the assembling of the pressure mass matrix as in step-22 but I am using stabilized Q1-Q1 elements so the zero entry is actually occupied.Is there any other better way someone can suggest?Or am understanding wrong in terms of the memory allocation? Thanks in advance Alex
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