[R] Combining Dataframes
Andy Fugard
a.fugard at ed.ac.uk
Sun Feb 25 19:35:50 CET 2007
Would need more info. Merge could still do the job; you might just
have to call it approx a dozen - 1 times!
Andy
On 25 Feb 2007, at 16:27, Bert Jacobs 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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> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Andy Fugard, Postgraduate Research Student
Psychology (Room F15), The University of Edinburgh,
7 George Square, Edinburgh EH8 9JZ, UK
Mobile: +44 (0)78 123 87190 http://www.possibly.me.uk
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