MatGetBlockSizes — PETSc 3.22.5 documentation

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# MatGetBlockSizes

Returns the matrix block row and column sizes.

## Synopsis

    #include "petscmat.h"
    PetscErrorCode MatGetBlockSizes(Mat mat, PetscInt *rbs, PetscInt *cbs)

Not Collective

## Input Parameter

- mat - the matrix

## Output Parameters

- rbs - row block size

- cbs - column block size

## Notes

Block row formats are `MATBAIJ` and `MATSBAIJ` ALWAYS have square block storage in the matrix. If you pass a different block size for the columns than the rows, the row block size determines the square block storage.

If a block size has not been set yet this routine returns 1.

## See Also

Matrices, `Mat`, `MATBAIJ`, `MATSBAIJ`, `MatCreateSeqBAIJ()`, `MatCreateBAIJ()`, `MatGetBlockSize()`, `MatSetBlockSize()`, `MatSetBlockSizes()`

## Level

intermediate

## Location

src/mat/interface/matrix.c

Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages