petsc-3.14.5 2021-03-03
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# ISPermutation

PETSC_TRUE or PETSC_FALSE depending on whether the index set has been declared to be a permutation.

### Synopsis

    #include "petscis.h"
    PetscErrorCode  ISPermutation(IS is,PetscBool  *perm)

Logically Collective on IS

### Input Parmeters

| is | - the index set

### Output Parameters

| perm | - PETSC_TRUE if a permutation, else PETSC_FALSE

Note: If it is not alread known that the IS is a permutation (if ISSetPermutation() or ISSetInfo() has not been called), this routine will not attempt to compute whether the index set is a permutation and will assume perm is PETSC_FALSE. To compute the value when it is not already known, use ISGetInfo() with the compute flag set to PETSC_TRUE.

### See Also

ISSetPermutation(), ISGetInfo()

### Level

intermediate

### Location

src/vec/is/is/interface/index.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages