On 12/04/2017 12:04 PM, Peimeng Yin wrote:
I want to solve a linear system, which has the following form
(A+B A^{-1} B) u = f
Here A is a diagonal black matrix, B is a block matrix that I can figure
out the pattern. Are there any solver that I can use to solve the linear
system?
Yes. Have you taken a look at step-20 and step-22? They do exactly this
sort of thing.
Can I figure out the pattern of B*B or BA^{-1}B ?
In general, A^{-1} is going to be a dense matrix even if A is a sparse
matrix. So building this matrix is not efficient.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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