[R] give all combinations

[Lucien Lemmens]

Yuan Jian <jayuan2008 <at> yahoo.com> writes:

> 
> Hello,
>  
> is there a simple way to give all combinations for a given vector:
>  
> v<-c("a","b","c")
>  
> combination(v,v) becomes
> "aa","ab","ac","bb","bc","cc'
>  
> combination(v,v,v) becomes
> "aaa","aab","aac","abb",......
>  
vv<-c(outer(v,v,paste))
 vv
[1] "a a" "b a" "c a" "a b" "b b" "c b" "a c" "b c" "c c"
vvv<-c(outer(vv,v,paste)
 vvv
 [1] "a a a" "b a a" "c a a" "a b a" "b b a" "c b a" "a c a" "b c a" 
"c c a" "a a b" "b a b" "c a b" "a b b" "b b b" 
"c b b"
[16] "a c b" "b c b" "c c b" "a a c" "b a c" "c a c" 
"a b c" "b b c" "c b c" "a c c" "b c c" "c c c"

>  
> 
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> 
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