ISBlockSetIndices#
Set integers representing blocks of indices in an index set.
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
n - the length of the index set (the number of blocks)
idx - the list of integers, one for each block, the integers contain the index of the first index of each block divided by the block size
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}.
See Also#
ISCreateStride()
, ISCreateGeneral()
, ISAllGather()
, ISCreateBlock()
, ISBLOCK
, ISGeneralSetIndices()
Level#
beginner
Location#
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