PetscSortRealWithPermutation — PETSc 3.25.1 documentation

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# PetscSortRealWithPermutation

Computes the permutation of `PetscReal` that gives a sorted sequence.

## Synopsis

    #include "petscsys.h"
    PetscErrorCode PetscSortRealWithPermutation(PetscInt n, const PetscReal i[], PetscInt idx[])

Not Collective

## Input Parameters

- n - number of values to sort

- i - values to sort

- idx - permutation array. Must be initialized to 0:`n`-1 on input.

## Note

On output, `i` is unchanged and `idx[j]` is the position of the `j`th smallest `PetscReal` in `i`.

## See Also

`PetscSortReal()`, `PetscSortIntWithPermutation()`

## Level

intermediate

## Location

src/sys/utils/sortip.c

## Examples

src/snes/tutorials/ex13.c
src/ts/tutorials/extchem.c

Index of all Sys routines
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Index of all manual pages