[R] all combinations with replacement not ordered

[William Dunlap]

Is this what you want?
   f <- function (x, m)  combn(x + m - 1, m) - seq_len(m) + 1

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of Konstantin Tretiakov
> Sent: Thursday, November 07, 2013 5:38 AM
> To: r-help at r-project.org
> Subject: [R] all combinations with replacement not ordered
> 
> Hello!
> 
> I need to obtain all possible combinations with replacement when order is
> not important.
> E.g. I have a population x{1,2,3}.
> So I can get (choose(3+3-1,3)=) 10 combinations from this population with
> 'size=3'.
> How can I get a list of all that combinations?
> 
> I have tried 'expand.grid()' and managed to get only samples where order is
> important.
> 'combn()' gave me samples without replacement.
> 
> Best regards,
> Konstantin Tretyakov.
> 
> 	[[alternative HTML version deleted]]
> 
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