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 Parameters#
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 Parameter#
index - the rank of the subset in lexicographic order
Note#
Limited by arguments such that n choose k can be represented by PetscInt
See Also#
PetscDTEnumSubset(), PetscDTFactorial(), PetscDTFactorialInt(), PetscDTBinomial(), PetscDTBinomialInt(), PetscDTEnumPerm(), PetscDTPermIndex()
Level#
beginner
Location#
Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages