On 3/14/21 2:33 PM, Andrey Volkov wrote:
So, before doing this, I would like to inquire the following questions:
* Is there a functional in the deal.ii that allows extracting mentioned
above "sub-block matrix" from the global block matrix? Could recommend
something?
Yes:
system_matrix.block(0,0)
gives you a reference to the top left block :-)
You probably want to take a look at how step-20 or step-22 solve their (block)
linear systems. They use exactly the kind of approach you are looking for.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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