rje (version 1.12.1)

combinations: Combinations of Integers

Description

Returns a matrix containing each possible combination of one entry from vectors of the lengths provided.

Usage

combinations(p)
powerSetMat(n)

Value

A matrix with number of columns equal to the length of p, and number of rows equal to \(p_1 \times \cdots \times p_k\), each row corresponding to a different combination. Ordering is reverse-lexographic.

Arguments

p

vector of non-negative integers.

n

non-negative integer.

Author

Robin Evans

Details

Returns a matrix, each row being one possible combination of integers from the vectors \((0, 1, \ldots, p_i-1)\), for \(i\) between 1 and length(p).

Based on bincombinations from package e1071, which provides the binary case.

powerSetMat is just a wrapper for combinations(rep(2, n)).

Examples

combinations(c(2,3,3))

powerSetMat(3)