HI, Dear R community, I have a large data set names dd.txt, the columns are: there are 2402 variables.
a1, b1, ..z1, a11, b11, ...z11, a111, b111, ..z111.. IF I dont know the relative position of the columns, but I know I need the following variables: var<-c(a1, c1,a11,b11,f111) Can I use read.columns to read the data into R? I have tried the following codes, but it does not work hh<-read.columns("/house/homedirs/c/cdu/operon/gh/dd.dimer", required.col=NULL, text.to.search=var, sep="\t", skip=0, quote="", fill=T) dim(hh) 468, 2402 hh<-read.columns("/house/homedirs/c/cdu/operon/gh/dd.dimer", required.col=var, text.to.search="", sep="\t", skip=0, quote="", fill=T) dim(hh) 0, 0 Can anyone help me with this? Thanks, -- Sincerely, Changbin -- [[alternative HTML version deleted]] ______________________________________________ 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.