[petsc-users] How to get number of local nonzeros of a matrix?

[Junchao Zhang]

Hello,
  I create a MPIAIJ matrix.  How can I know the # of nonzeros stored
locally?
  Furthermore, in case it is needed, how can I get access to the Compress
Sparse Row(CSR) data structure of the local matrix, i.e., the row pointer
array, column index array, value array?

  Thank you!
-- Junchao Zhang
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