ISSetBlockSize#
informs an index set that it has a given block size
Synopsis#
#include "petscis.h"
PetscErrorCode ISSetBlockSize(IS is, PetscInt bs)
Logicall Collective
Input Parameters#
is - index set
bs - block size
Notes#
This is much like the block size for Vecs. It indicates that one can think of the indices as
being in a collection of equal size blocks. For ISBLOCK these collections of blocks are all contiguous
within a block but this is not the case for other IS. For example, an IS with entries {0, 2, 3, 4, 6, 7} could
have a block size of three set.
ISBlockGetIndices() only works for ISBLOCK, not others.
See Also#
IS, ISGetBlockSize(), ISCreateBlock(), ISBlockGetIndices(),
Level#
intermediate
Location#
Examples#
src/ksp/ksp/tutorials/ex73.c
src/ksp/ksp/tutorials/ex76.c
src/ksp/ksp/tutorials/ex49.c
Implementations#
ISSetBlockSize_Block() in src/vec/is/is/impls/block/block.c
ISSetBlockSize_General() in src/vec/is/is/impls/general/general.c
ISSetBlockSize_Stride() in src/vec/is/is/impls/stride/stride.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages