Dr. Heister, I am really a beginner of deal ii, thank you very much for pointing this out for me.
Btw, on my second question, is it possible to do a loop operation over each nodes and find their surrounding elements? Have a good weekend! Xujun On Sat, Aug 18, 2012 at 11:56 AM, Timo Heister <[email protected]>wrote: > Dear Xujun, > > > 3. If I assembled two sets of global matrix, say, [ A ], [ B ] and rhs > {f}, > > respectively > > [ A ]*{u} + [ B ]*{a} = {f} > > [ B ]_T *{a} = {g} > > how can I combine them as a big matrix K ? for example, > > K = [ A B ] > > [ BT 0 ] > > F = {f} > > {g} > > take a look at BlockMatrix etc. explained in step-20: > http://www.dealii.org/developer/doxygen/deal.II/step_20.html > You would create a BlockMatrix first and each entry in that > BlockMatrix is a normal SparseMatrix that you could fill separately > (or at once as described in the tutorial). > > -- > Timo Heister > http://www.math.tamu.edu/~heister/ > -- PhD Candidate Department of Mechanical Engineering Northwestern University Evanston, IL, United States
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