PetscDTEnumSubset — PETSc 3.21.4 documentation

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# PetscDTEnumSubset

Split the integers [0, …, n - 1] into two complementary ordered subsets, the first subset of size k and being the jth subset of that size in lexicographic order.

## Input Parameters

- n - a non-negative integer (see note about limits below)

- k - an integer in [0, n]

- j - an index in [0, n choose k)

## Output Parameters

- perm - the jth subset of size k of the integers [0, …, n - 1], followed by its complementary set.

- isOdd - if not `NULL`, return whether perm is an even or odd permutation.

## Note

Limited by arguments such that `n` choose `k` can be represented by `PetscInt`

## See Also

`PetscDTEnumSubset()`, `PetscDTSubsetIndex()`, `PetscDTFactorial()`, `PetscDTFactorialInt()`, `PetscDTBinomial()`, `PetscDTBinomialInt()`, `PetscDTEnumPerm()`, `PetscDTPermIndex()`

## Level

beginner

## Location

include/petscdt.h

Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages