Thanks for your help. I produced info.txt: (e.g.) fullname: Rafael A. Irizarry method: MAS 5.0 nickname: MAS 5.0 competition: YES URL: http://www.affymetrix.com/support/technical/technotes/statistical _algorithms_technote.pdf > affycomp.info <- read.table("H:/Profile/Eigene Dateien/Dip_bak/Pr_sp rach/R/info/info.txt",sep="\t",as.is=TRUE,quote="") is Ok... I control affycomp.info: > affycomp.info V1 1 fullname: Rafael A. Irizarry 2 method: MAS 5.0 3 nickname: MAS 5.0 4 competition: YES 5 URL: http://www.affymetrix.com/support/technical/technotes/statistic al_algorithms_technote.pdf afterwards: > method.name <- affycomp.info[3,2] Error in "[.data.frame"affycomp.info, 3, 2) : undefined columns selected where does error lie? Thnaks, Mohammad

Hi Mohammad, Mohammad Esad-Djou wrote: > Thanks for your help. > > I produced info.txt: (e.g.) > > fullname: Rafael A. Irizarry > method: MAS 5.0 > nickname: MAS 5.0 > competition: YES > URL: http://www.affymetrix.com/support/technical/technotes/statistic al_algorithms_technote.pdf > > >>affycomp.info <- read.table("H:/Profile/Eigene Dateien/Dip_bak/Pr_sp rach/R/info/info.txt",sep="\t",as.is=TRUE,quote="") > > is Ok... > I control affycomp.info: > > >>affycomp.info > > V1 > 1 fullname: Rafael A. Irizarry > 2 method: MAS 5.0 > 3 nickname: MAS 5.0 > 4 competition: YES > 5 URL: http://www.affymetrix.com/support/technical/technotes/statist ical_algorithms_technote.pdf > > afterwards: > I am not just sure what afterwards is supposed to mean here, > >>method.name <- affycomp.info[3,2] > > Error in "[.data.frame"affycomp.info, 3, 2) : > undefined columns selected > > You could see the dimensions of affycomp.info by going dimaffycomp.info) and I suspect that it does not have 2 columns - and so your command is in error. You have asked for an entry that does not exist. Is there some reason that you think that read.table will return a matrix? You might read the manual page for read.table - especially the part about separators (did you put tabs into the file you created?) Best wishes, Robert > where does error lie? > > Thnaks, > Mohammad > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor >