#include "petscis.h" PetscErrorCode ISSetInfo(IS is, ISInfo info, ISInfoType type, PetscBool permanent, PetscBool flg)Logically Collective on IS if type is IS_GLOBAL
| is | - the index set | |
| info | - describing a property of the index set, one of those listed below, | |
| type | - IS_LOCAL if the information describes the local portion of the index set, IS_GLOBAL if it describes the whole index set | |
| permanent | - PETSC_TRUE if it is known that the property will persist through changes to the index set, PETSC_FALSE otherwise If the user sets a property as permanently known, it will bypass computation of that property | |
| flg | - set the described property as true (PETSC_TRUE) or false (PETSC_FALSE) |
| IS_SORTED | - the [local part of the] index set is sorted in ascending order | |
| IS_UNIQUE | - each entry in the [local part of the] index set is unique | |
| IS_PERMUTATION | - the [local part of the] index set is a permutation of the integers {0, 1, ..., N-1}, where N is the size of the [local part of the] index set | |
| IS_INTERVAL | - the [local part of the] index set is equal to a contiguous range of integers {f, f + 1, ..., f + N-1} | |
| IS_IDENTITY | - the [local part of the] index set is equal to the integers {0, 1, ..., N-1} |
It is possible to set a property with ISSetInfo() that contradicts what would be previously computed with ISGetInfo()