petsc-3.12.5 2020-03-29
ISInvertPermutation
Creates a new permutation that is the inverse of a given permutation.
Synopsis
#include "petscis.h"
PetscErrorCode ISInvertPermutation(IS is,PetscInt nlocal,IS *isout)
Collective on IS
Input Parameter
| is | - the index set
|
| nlocal | - number of indices on this processor in result (ignored for 1 proccessor) or
use PETSC_DECIDE
|
Output Parameter
isout -the inverse permutation
Notes
For parallel index sets this does the complete parallel permutation, but the
code is not efficient for huge index sets (10,000,000 indices).
Level
intermediate
Location
src/vec/is/is/interface/index.c
Implementations
ISInvertPermutation_Block in src/vec/is/is/impls/block/block.c
ISInvertPermutation_General in src/vec/is/is/impls/general/general.c
ISInvertPermutation_Stride in src/vec/is/is/impls/stride/stride.c
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages