ncombinations {arrangements}R Documentation

Number of combinations

Description

Number of combinations

Usage

ncombinations(x = NULL, k = n, n = NULL, v = NULL, freq = NULL,
  replace = FALSE, bigz = FALSE)

Arguments

x

an integer or a vector, will be treated as n if integer; otherwise, will be treated as v

k

an integer, the number of items drawn

n

an integer, the total number of items, its actual value may be determined by other variables

v

a vector to be drawn

freq

an integer vector of item repeat frequencies

replace

an logical to draw items with replacement

bigz

an logical to use gmp::bigz

See Also

combinations for generating all combinations and icombinations for iterating combinations

Examples

ncombinations(5, 2)
ncombinations(LETTERS, k = 5)

# integer overflow
## Not run: ncombinations(40, 15)
ncombinations(40, 15, bigz = TRUE)

# number of combinations of `c("a", "b", "b")`
# they are `c("a", "b")` and `c("b", "b")`
ncombinations(k = 2, freq = c(1, 2))

# zero sized combinations
ncombinations(5, 0)
ncombinations(5, 6)
ncombinations(0, 1)
ncombinations(0, 0)


[Package arrangements version 1.1.5 Index]