Generation of all the combinations of k elements from n possible

Description

Generates all different subsets of size r chosen from n different elements.

Usage

1
subsets(n, r, v = 1:n)

Arguments

n

numeric. Number of elements to choose from.

r

numeric. Size of the subsets.

v

vector. Numeric or character vector of size n with the labels of the n elements to choose from.

Value

A matrix of dimension (N x r), where N is the total number of different combinations of r elements chosen from n possible.

Note

This particular version of the function was taken from a message from Bill Venables to ‘r-help’ list on Sun, 17 Dec 2000.

Author(s)

Bill Venables Bill.Venables@cmis.csiro.au

References

Venables, Bill. "Programmers Note", R-News, Vol 1/1, Jan. 2001. http://cran.r-project.org/doc/Rnews

See Also

combinations of the gtools package.

Examples

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library(BHH2)
subsets(5,3)
subsets(5,3,letters)
subsets(5,3,c(10,20,30,50,80))