Matrix blocks

[Michel Cancelliere]

Hi All,

I am building a shell preconditioner, for implement that I should divide a
sparse matrix into four blocks of dimension N/2xN/2 (N size of the Matrix),
I took a look to src/mat/examples/tutorials/ex2 but it is for dense matrix.
There is a function for do that in Petsc? or another method for efficiently
implementation?

Thank you,

Michel Cancelliere
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