[R] Unordered combinations with repetition

[Thomas Chesney]

Thank you Nicholas.

I've found that Urnsamples in the prob package does it too:

urnsamples(1:2, size = 2, replace = TRUE, ordered = FALSE)

Thomas
________________________________________
From: WRAY NICHOLAS [nicholas.wray at ntlworld.com]
Sent: Tuesday, June 09, 2015 10:52 AM
To: Thomas Chesney
Cc: r-help at r-project.org
Subject: Re: [R] Unordered combinations with repetition

You could try expand.grid -- you'd prob need to modify what's beneath
a=c(0,1,2)
b=c(0,1)
c=c(0,1)
y<-list()
y[[1]]<-a
y[[2]]<-b
y[[3]]<-c
expand.grid(y)
This code gives all combinations


On 9 June 2015 at 10:11, Thomas Chesney <Thomas.Chesney at nottingham.ac.uk<mailto:Thomas.Chesney at nottingham.ac.uk>> wrote:
Does anyone know of a function that will return all unordered combinations of n elements from a list with repetition?

The combs function in caTools will do this without repetition:

combs(1:2, 2)

     [,1] [,2]
[1,]    1    2

What I'd like is:

1 1
1 2
2 2

Thank you,

Thomas Chesney



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