Hello Wolfgang, thanks very much for your information.
I got the point. Best regards Lance Wolfgang Bangerth <[email protected]> 于 2023年11月13日周一 21:01写道： > > On 11/13/23 03:05, Lance Zhang wrote: > > > > I wonder whether the stiffness matrix could be converted to a matrix > > with rows = cell_numbers and columns = cell_numbers. > > Lance: > I think I mentioned this before: You can't. The entries of the stiffness > matrix are sums over contributions from different cells. So, in 2d with > Q1 elements for example, every matrix entry A_{ij} has the form > > A_{ij} = a+b+c+d > > where a...d are the contributions of the four cells adjacent to vertex i > (or j). Once you add these four numbers together, you can no longer > determine what the four numbers were. If you need the contributions of > individual cells, you need to store them before you add them together. > > Best > W. > > -- > The deal.II project is located at http://www.dealii.org/ > For mailing list/forum options, see > https://groups.google.com/d/forum/dealii?hl=en > --- > You received this message because you are subscribed to a topic in the > Google Groups "deal.II User Group" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/dealii/1sVmdUIFY3k/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/dealii/b50df74b-e825-4a66-b6bb-4fbd72aa43f9%40colostate.edu > . > -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/CADwW6PmNwW2ZimY097wge8DP-jGRV_GBCYEJk1eC_W6Q035cKA%40mail.gmail.com.
