If you for some reason want to be shown all the possible combinations, try
expand.grid(1:20,1:20,1:20,1:20) (ugly code). Don't use this for sampling.

hth Rafael

2010/6/16 Jorge Ivan Velez <jorgeivanvelez@gmail.com>

> Try
>
> sample(20, 4, replace = TRUE)
>
> HTH,
> Jorge
>
>
> On Wed, Jun 16, 2010 at 10:20 AM, Somnath Somnath <> wrote:
>
> > Dear all, good morning,
> >
> > I have a population, let say members are tagged with some simple number
> > like
> > 1,2,3,...20. I want to draw a sample with replacement of size 4 (say, can
> > be
> > more than 20 also). Is there any R function which will show me all such
> > possible samples?
> >
> > Thanks
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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