expandGridCount: Count of the Cartesian Product

In RcppAlgos: High Performance Tools for Combinatorics and Computational Mathematics

Count of the Cartesian Product

Description

Calculate the number of Cartesian products of the input vectors.

Usage

    expandGridCount(...)

Arguments

...	vectors, factors or a list containing these. (See ?expand.grid).

Value

When the number of results exceeds 2^{53} - 1, a number of class bigz is returned.

Author(s)

Joseph Wood

See Also

expandGrid

Examples

## description example
lst = list(1:2, 1:2)

## Using base R
t = expand.grid(lst)
nrow(t)

## vs calling expandGridCount directly
expandGridCount(lst)

## Call it just like you would if you were generating the results
expandGridCount(1:5, 3:9, letters[1:5], letters[c(1,4,5,8)])

## Same as
nrow(expand.grid(1:5, 3:9, letters[1:5], letters[c(1,4,5,8)]))

lst = Map(function(x, y) x:y, 8:33, 15:40)

## Return object of class 'bigz'
expandGridCount(lst)

RcppAlgos documentation built on March 8, 2026, 9:08 a.m.