Got it working with a package called 'xlsReadWritePro' (which requires a license after 30 day's...) This is my code: setwd("J:/Stage/Datasets2/Datasets/outData")
masterTable<-read.table("AR1000900A_N_241110_(Mapping250K_Nsp)_2,Mapping250K_Nsp,CNprobes.tab _SNP_IDs.xls",sep="\t", dec=",", fill=T, header=T) masterTable<-data.frame(masterTable) fileNames<-list.files(getwd(), pattern='_0,5 -0,51.xls') library(xlsReadWritePro) regionMatchM<-data.frame() write.xls(regionMatchM, file= "Array012345.xls") for(i in 1:5) { fileName <- fileNames[i] newFile <- file.path(getwd(), paste(fileNames[i], "samen_0,5 -0,51.xls")) snpidFile<-read.table(fileNames[i],sep="\t", dec=",", fill=T, header=T) snpidFile<-data.frame(snpidFile) regionMatch<-cbind(masterTable, snpidFile[match(masterTable$Pos, snpidFile$Pos),]) regionMatchABCDE<-data.frame(regionMatch[10:18]) write.xls(regionMatchABCDE, file= "Array012345.xls", naStrings = "NAN", append=T, from= c(1,(1+i)*9), rowNames=FALSE) } genomeInfo<-read.xls("Array012345.xls") len<-length(genomeInfo[1,]) finalTable<-data.frame(masterTable, genomeInfo[,18:len]) summary(finalTable) write.table(finalTable, file= "Array012345_final1.xls", append=F, col.names=T, row.names=F, quote=F, sep = "\t") Thanks for the help anyway. If someone has a solution for this problem, without the need of a package, please reply -- View this message in context: http://r.789695.n4.nabble.com/appending-collums-in-for-loop-tp3393446p3396610.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.