all-subsets ( seq -- subsets ) (original) (raw)

all-subsets ( seq -- subsets )

Vocabulary
math.combinatorics

Inputs

Outputs

Word description
Returns all the subsets of a sequence.

Examples

USING: math.combinatorics prettyprint ; { 1 2 3 } all-subsets .
{ { } { 1 } { 2 } { 3 } { 1 2 } { 1 3 } { 2 3 } { 1 2 3 } }

Definition

USING: kernel ranges sequences ;

IN: math.combinatorics

: all-subsets ( seq -- subsets )
dup length [0..b] [ all-combinations ] with map concat ;