all-selections ( seq n -- seq' )

Vocabulary

math.combinatorics

Inputs

seq	a sequence
n	an integer

Outputs

seq'	a sequence

Word description

Returns all the ways to take n (possibly the same) items from the sequence of items.

Examples

USING: math.combinatorics prettyprint ; { 1 2 } 2 all-selections .
{ { 1 1 } { 1 2 } { 2 1 } { 2 2 } }

Definition

IN: math.combinatorics

: all-selections ( seq n -- seq' ) [ ] map-selections ;