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

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 > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor