petsc-3.7.7 2017-09-25
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# 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}.

### See Also

ISCreateStride(), ISCreateGeneral(), ISAllGather()

Level:beginner
Location: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