petsc-master 2020-10-26
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calculate the permutation of the indices into a nondecreasing order.


#include "petscis.h"  
PetscErrorCode ISSortPermutation(IS f,PetscBool always,IS *h)
Not collective.

Input arguments

f - IS to sort
always - build the permutation even when f's indices are nondecreasing.

Output argument

h - permutation or NULL, if f is nondecreasing and always == PETSC_FALSE.

Note: Indices in f are unchanged. f[h[i]] is the i-th smallest f index. If always == PETSC_FALSE, an extra check is peformed to see whether the f indices are nondecreasing. h is built on PETSC_COMM_SELF, since the permutation has a local meaning only.

See Also

ISLocalToGlobalMapping, ISSort()




Index of all IS routines
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Index of all manual pages