petsc-3.14.6 2021-03-30

ISEqual

Compares if two index sets have the same set of indices.

Synopsis

#include "petscis.h"  
PetscErrorCode  ISEqual(IS is1,IS is2,PetscBool  *flg)

Collective on IS

Input Parameters

is1, is2

- The index sets being compared

Output Parameters

flg

- output flag, either PETSC_TRUE (if both index sets have the same indices), or PETSC_FALSE if the index sets differ by size or by the set of indices)

Note

This routine sorts the contents of the index sets before the comparision is made, so the order of the indices on a processor is immaterial.

Each processor has to have the same indices in the two sets, for example,

          Processor

            0      1

   is1 = {0, 1} {2, 3}

   is2 = {2, 3} {0, 1}

will return false.

Level

intermediate

Location

src/vec/is/is/utils/iscomp.c

Implementations

ISEqual_private in src/mat/impls/sbaij/mpi/mpisbaij.c

Index of all IS routines
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Index of all manual pages