Dear David Problem solved ! Remarkably, I saw your previous post about stringsasFactors <- false and that was the root of the problem. I was trying to rename the columns according to contents of one of the rows of the data frame, which were being interpreted as factors (which I hadn't realised) and that's why the assignment as new column names didn't work !
Thanks for your help, albeit inadvertent ! Benny Benjamin Chain Division of Infection and Immunity Windeyer Building UCL, 46 Cleveland St. London W1T 4JF Fax 00 44 20 7679 9301 -----Original Message----- From: David Winsemius [mailto:dwinsem...@comcast.net] Sent: 31 May 2009 17:11 To: Benny Chain Cc: r-help@r-project.org Subject: Re: [R] renaming column names Cannot reproduce with a toy example: > data <- data.frame(a=1:3, b=4:6, c=6:8) > colnames(data) <- c("d","e","f") > colnames(data) [1] "d" "e" "f" Perhaps you need to produce more detail. Surely offering the results of dput(a) would not tax the limits of the R-mail server. -- David On May 31, 2009, at 11:58 AM, Benny Chain wrote: > I am trying to rename the column names of a data frame called > "data". It has > 177 columns. I have used : > > colnames(data) <- a > > > > where a is a vector with 177 character names. > > > > I don't get any error message, but the column names don't change > because > when I then type : > > colnames(data) > > > > I get the same set of names as before, so the assignment doesnt seem > to have > worked. > > > > Any ideas or suggestions gratefully received. > > > > Benny Chain > > Benjamin Chain > > Division of Infection and Immunity > > Windeyer Building > > UCL, 46 Cleveland St. > > London W1T 4JF > > Fax 00 44 20 7679 9301 > > > > > [[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. David Winsemius, MD Heritage Laboratories West Hartford, CT ______________________________________________ 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.
