all-combinations ( seq k -- seq' ) (original) (raw)
all-combinations ( seq k -- seq' )
Vocabulary
math.combinatorics
Inputs
| seq | a sequence |
|---|---|
| k | a non-negative integer |
Outputs
| seq' | a sequence |
|---|
Word description
Outputs a sequence containing all combinations of seq choosing k elements, in lexicographical order.
Examples
USING: math.combinatorics prettyprint ; { "a" "b" "c" "d" } 2 all-combinations .
{ { "a" "b" } { "a" "c" } { "a" "d" } { "b" "c" } { "b" "d" } { "c" "d" } }
Definition
: all-combinations ( seq k -- seq' ) [ ] map-combinations ;