Ali:
Thanks a lot for your responses. Wolfgang kindly gave a concise and clear
restatement of my question. So to my understanding it seems that as long as we
have defined block vectors and matrices in setup_system properly, and have
taken care of correct combinations of trial and test functions within the
assembly, we can almost be sure that the rest is handled by deal.ii.
You can be totally sure :-)
But may I ask about step-44 in which the shape functions (?) are addressed
through system_to_component/base_index? Are these (steps 20 and 44,8) just two
different approaches as explained in the Handling vector valued problems
module? I was wondering when we might need to follow step-44 and for example
evaluate i_group and j_group s within the assembly function?
You already point to the correct documentation module. The two ways lead to
the same outcome. Doing it the way of step-8/44 requires more writing and
hand-calculations, but is marginally faster. step-20 is more automatic and
closer to the mathematical notation we see in papers and books, but is
marginally slower. Which way you choose is mostly a question of personal
preference.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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