[BioC] order

[Sean Davis]

see ?as.numeric

ord <- order(as.numeric(l[,2]))

On May 3, 2005, at 8:32 AM, Heike Pospisil wrote:

> Hello everybody,
>
> I have a question concerning the order function in R. I have a matrix 
> of genes (X1) and the corresponding p-values (X2):
>
> > l
>      X1                   X2
> 1  97511    0.954592909444367
> 2  97522    0.999844154885015
> 3  97534    0.922142091452795
> 4  97560    0.978737666181316
> 5  97599    0.530776889626182
> 6  97607    0.254772654483606
> 7  97842 1.49336790005039e-07
> 8  98251    0.903879966892844
> 9  98606    0.212427336357742
> 10 98783    0.408353158009378
> 11 98785    0.293268511926562
>
> I would like to sort this list by the p-values.
>
> > ord<-order(l[,2])
>
>
> Unfortunately, I do not get the numerical sorted p-values, but the 
> alphanumerical orderd values:
>
> > l[ord,]
>       X1                   X2
> 9  98606    0.212427336357742
> 6  97607    0.254772654483606
> 11 98785    0.293268511926562
> 10 98783    0.408353158009378
> 5  97599    0.530776889626182
> 8  98251    0.903879966892844
> 3  97534    0.922142091452795
> 1  97511    0.954592909444367
> 4  97560    0.978737666181316
> 2  97522    0.999844154885015
> 7  97842 1.49336790005039e-07
>
> Do you have any hint to sort this list numerically?
>
> Thanks in advance.
> Heike
> -- 
> Dr. Heike Pospisil
> Center for Bioinformatics, University of Hamburg
> Bundesstrasse 43, 20146 Hamburg, Germany
> phone: +49-40-42838-7303 fax: +49-40-42838-7312
>
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