MatSetBlockSize

Sets the matrix block size.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatSetBlockSize(Mat mat, PetscInt bs)

Logically Collective

Input Parameters

• mat - the matrix

• bs - block size

Notes

Block row formats are MATBAIJ and MATSBAIJ 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 MATAIJ matrix format, this function can be called at a later stage, provided that the specified block size is compatible with the matrix local sizes.

See Also

Matrices, Mat, MATBAIJ, MATSBAIJ, MATAIJ, MatCreateSeqBAIJ(), MatCreateBAIJ(), MatGetBlockSize(), MatSetBlockSizes(), MatGetBlockSizes()

Level

intermediate

Location

src/mat/interface/matrix.c

Examples

src/snes/tutorials/ex56.c
src/ksp/ksp/tutorials/ex56.c
src/ksp/ksp/tutorials/ex4.c
src/ksp/ksp/tutorials/ex55.c

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Index of all Mat routines
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Index of all manual pages