int HYPRE_IJMatrixSetDiagOffdSizes

(HYPRE_IJMatrix matrix,
  const int* diag_sizes,
  const int* offdiag_sizes)

(Optional) Set the max number of nonzeros to expect in each row of the diagonal and off-diagonal blocks.

Documentation

(Optional) Set the max number of nonzeros to expect in each row of the diagonal and off-diagonal blocks. The diagonal block is the submatrix whose column numbers correspond to rows owned by this process, and the off-diagonal block is everything else. The arrays diag_sizes and offdiag_sizes contain estimated sizes for each row of the diagonal and off-diagonal blocks, respectively. This routine can significantly improve the efficiency of matrix construction, and should always be utilized if possible.

Not collective.

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