[R] How to do this "combination" ?

[Erich Neuwirth]

combinat<-function(els,len){
if (len==1) (return(as.character(els)))
else return(as.vector(t(outer(combinat(els,len-1),as.character(els),
     function(x,y)paste(x,y,sep="")))))
}

combinat(1:2,3)
does what you want



wanr at ucalgary.ca wrote:

> Thanks David first.
> 
> Probably, David misunderstood my points.
> 
> source vector = (1,2)
> the length of the target vector = 3
> 
> My expected "complete" outputs should be:
> 111, 112, 121, 122, 211, 212, 221, 222.
> 
> sample(c(1,2),3,replace=TRUE) just gives me one "randomly sampled" 
> combination at a time. However, I need the whole list displayed above at a 
> time.
> 
> Rui
> 
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Erich Neuwirth, Computer Supported Didactics Working Group
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