petsc-3.13.1 2020-05-02
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PetscDTSubsetIndex

Convert an ordered subset of k integers from the set [0, ..., n - 1] to its encoding as an integers in [0, n choose k) in lexicographic order. This is the inverse of PetscDTEnumSubset.

Input Arguments

n - a non-negative integer (see note about limits below)
k - an integer in [0, n]
subset - an ordered subset of the integers [0, ..., n - 1]

Output Arguments

index -the rank of the subset in lexicographic order

Note: this is limited by arguments such that n choose k can be represented by PetscInt

See Also

PetscDTEnumSubset()

Level

beginner

Location

src/dm/dt/space/../../../../include/petscdt.h
Index of all SPACE routines
Table of Contents for all manual pages
Index of all manual pages