petsc-3.12.5 2020-03-29
MatSetBlockSize
Sets the matrix block size.
Synopsis
#include "petscmat.h"
PetscErrorCode MatSetBlockSize(Mat mat,PetscInt bs)
Logically Collective on Mat
Input Parameters
| mat | - the matrix
|
| bs | - block size
|
Notes
Block row formats are MATSEQBAIJ, MATMPIBAIJ, MATSEQSBAIJ, MATMPISBAIJ. These formats ALWAYS have square block storage in the matrix.
This must be called before MatSetUp() or MatXXXSetPreallocation() (or will default to 1) and the block size cannot be changed later.
For MATMPIAIJ and MATSEQAIJ matrix formats, this function can be called at a later stage, provided that the specified block size
is compatible with the matrix local sizes.
See Also
MatCreateSeqBAIJ(), MatCreateBAIJ(), MatGetBlockSize(), MatSetBlockSizes(), MatGetBlockSizes()
Level
intermediate
Location
src/mat/interface/matrix.c
Examples
src/ksp/ksp/examples/tutorials/ex4.c.html
src/ksp/ksp/examples/tutorials/ex55.c.html
src/ksp/ksp/examples/tutorials/ex56.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages