petsc-3.7.3 2016-07-24
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# MatFindOffBlockDiagonalEntries

Finds all the rows of a matrix that have entries outside of the main diagonal block (defined by the matrix block size)

### Synopsis

    #include "petscmat.h"
    PetscErrorCode MatFindOffBlockDiagonalEntries(Mat mat,IS *is)

Collective on Mat

### Input Parameter

mat -the matrix

### Output Parameter

is -contains the list of rows with off block diagonal entries

### See Also

MatMultTranspose(), MatMultAdd(), MatMultTransposeAdd()

Level:developer
Location: src/mat/interface/matrix.c
Index of all Mat routines
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Index of all manual pages