RcppAlgos (version 2.3.2)

comboCount: Number of combinations/permutations

Description

Calculate the number of combinations/permutations of a vector chosen \(m\) at a time with or without replacement. Additionally, these functions can calculate the number of combinations/permutations of multisets.

Usage

comboCount(v, m = NULL, repetition = FALSE, freqs = NULL)
permuteCount(v, m = NULL, repetition = FALSE, freqs = NULL)

Arguments

v

Source vector. If v is an integer, it will be converted to the sequence 1:v.

m

Number of elements to choose. If repetition = TRUE, m can exceed the length of v. The default is NULL.

repetition

Logical value indicating whether combinations/permutations should be with or without repetition. The default is FALSE.

freqs

A vector of frequencies used for producing all combinations/permutations of a multiset of v. Each element of freqs represents how many times each element of the source vector, v, is repeated. It is analogous to the times argument in rep. The default value is NULL.

Value

A numerical value.

See Also

comboGeneral, permuteGeneral

Examples

# NOT RUN {
## Same interface as the respective "general" functions:
## i.e. comboGeneral & permuteGeneral

comboCount(25, 12)

permuteCount(15, 7, TRUE)

comboCount(25, 12, freqs = rep(2, 25))

## Return object of class 'bigz'
comboCount(250, 15, freqs = rep(2, 250))
# }