petsc-3.10.5 2019-03-28
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# MatSubdomainsCreateCoalesce

Creates index subdomains by coalescing adjacent ranks' ownership ranges.

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatSubdomainsCreateCoalesce(Mat A,PetscInt N,PetscInt *n,IS *iss[])

Collective on A

### Input Parameters

| A | - the matrix to create subdomains from
| N | - requested number of subdomains

### Output Parameters

| n | - number of subdomains resulting on this rank
| iss | - IS list with indices of subdomains on this rank

### Notes

number of subdomains must be smaller than the communicator size

### Level

advanced

### Location

src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages