[R] Combining Dataframes

[Ranjan Maitra]

Hi,

This question has no connection with the original thread. Please do not post like this since it messes up threads since making searching by thread topics in archives useless.

Thank you,
Ranjan

On Sun, 25 Feb 2007 17:27:25 +0100 "Bert Jacobs" <b.jacobs at pandora.be> wrote:

> Hi,
> 
> What is the best way to combine several dataframes (approx a dozen, all
> having one column) into one? All dataframes have a different rowlength, and
> do not contain numbers.
> As this new dataframe should have the length of the dataframe with the most
> rows, the difference in rows with the other dataframes can be filled with
> the value NA.
> 
> I've tried merge (only possible with 2 df) and cbind (gives error)
> 
> Thx for helping me out.
> 
> 
> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Alberto Vieira
> Ferreira Monteiro
> Sent: 25 February 2007 16:52
> To: r-help at stat.math.ethz.ch
> Subject: Re: [R] Random Integers
> 
> Charles Annis, P.E. wrote:
> >
> > rpois(n, lambda)
> >
> > ... will do it.  But you should tell us something about how you want your
> > numbers to be distributed, since rpois() produces integers having a
> Poisson
> > distribution.
> >
> <nitpick>
> rpois does not generate random _integers_, it generates random 
> _natural numbers_.
> </nitpick>
> 
> The question should be more descriptive. "Random" is half of the things
> we need to know, the other half is how deterministic you want your integers.
> 
> For example, if you want to generate random integers in such a way that
> all integers have the same probability, then this can't be done. OTOH, if
> you want to simulate random integers that distribute "like integers appear
> in Nature", then it's still not precise, but there are serious attempts 
> to reproduce this behaviour. Check in the wikipedia (www.wikipedia.org)
> those distributions: Zip's law, Zeta distribution, Benford's law, 
> Zipf-Mandelbrot law. The problem is that all of them generate positive
> random integers, but it's not difficult to extrapolate them to integers.
> 
> Alberto Monteiro
> 
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>