petsc-3.13.6 2020-09-29

ISBlockSetIndices

The indices are relative to entries, not blocks.

Synopsis

#include "petscis.h"     
PetscErrorCode  ISBlockSetIndices(IS is,PetscInt bs,PetscInt n,const PetscInt idx[],PetscCopyMode mode)

Collective on IS

Input Parameters

	is	- the index set
	bs	- number of elements in each block, one for each block and count of block not indices
	n	- the length of the index set (the number of blocks)
	idx	- the list of integers, these are by block, not by location
	mode	- see PetscCopyMode, only PETSC_COPY_VALUES and PETSC_OWN_POINTER are supported

Notes

When the communicator is not MPI_COMM_SELF, the operations on the index sets, IS, are NOT conceptually the same as MPI_Group operations. The index sets are then distributed sets of indices and thus certain operations on them are collective.

Example

If you wish to index the values {0,1,4,5}, then use a block size of 2 and idx of {0,2}.

Level

beginner

Location

src/vec/is/is/impls/block/block.c

Implementations

ISBlockSetIndices_Block in src/vec/is/is/impls/block/block.c

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