> 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
Nope. It works just fine for a lot of people (including me) on a number of different 64-bit systems. > 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? I would do as in step-22, but instead of putting the preconditioner into the empty (1,1) block as done in step-22, I would allocate an entirely separate preconditioner matrix (in addition to the system matrix) and put the preconditioner there. step-31 does it that way. If you tell make_sparsity_pattern which blocks of the matrix you want to write to, you don't have to allocate any more entries in that preconditioner matrix than necessary. W. ------------------------------------------------------------------------- Wolfgang Bangerth email: [email protected] www: http://www.math.tamu.edu/~bangerth/ _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
