[BioC] Permutation of a data.frame

[Herve Pages]

Hi,

alex lam (RI) wrote:
> Dear Paul,
> 
> Not sure if I understand fully. I think you are saying that you want to shuffle the rows, but keep the code with its corresponding p-value together.
> 
> In that case, you can simply use the sample() function.
> 
> Index<-sample(1:nrow(DataFrame), size=nrow(DataFrame), replace=F)

Note that you can just use
  Index <- sample(nrow(DataFrame))
to generate a random permutation of the row indices.

> NewDataFrame<-DataFrame[Index, ] 
> 
> 

Cheers,
H.

> Cheers,
> Alex
> 
> ------------------------------------
> Alex Lam
> PhD student
> Department of Genetics and Genomics
> Roslin Institute (Edinburgh)
> Roslin
> Midlothian EH25 9PS
> Great Britain
> 
> Phone +44 131 5274471
> Web   http://www.roslin.ac.uk
> 
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> 
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> 
> 
> -----Original Message-----
> From: bioconductor-bounces at stat.math.ethz.ch [mailto:bioconductor-bounces at stat.math.ethz.ch] On Behalf Of Paul Christoph Schröder
> Sent: 17 May 2007 12:01
> To: bioconductor at stat.math.ethz.ch
> Subject: [BioC] Permutation of a data.frame
> 
> Hello all,
> 
> I have a data frame like this:
> 
>   Code         pvalue
> GT2984      0,0665
> GT9301      0.1203
> GT9271      0.0123
> GT1203      0.0023
> .............         ..........
> and so on.
> 
> I would like to permute only the rows, i.e. at start GT2984 with pvalue 0,0665 is at position 1 and after the random permutation it would be elsewhere but with his pvalue, i.e. GT2984 with pvalue 0,0665 at position 19. And this should happen with every row from the data.frame.
> 
> How could I achieve this?
> 
> Thanks in advance,
> 
> Paul
> 

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