Depending on what your final goal is, there may be a better approach, but to do as you state below, here is one set of options:
1) use read.csv (or read.table) and use the colClasses argument to specify keeping only column 5 2) use cbind to bind column 5 (now a data.frame) to another data.frame (possibly read in using read.csv), this assumes that the row order matches, merge is a possibility if they don't match. 3) use the subset command to select the rows, use the %in% operator to compare col 5 to your list of desired values. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare [EMAIL PROTECTED] (801) 408-8111 > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ng Stanley > Sent: Thursday, February 14, 2008 1:03 AM > To: r-help > Subject: [R] R equivalent of linux "cut", "paste", and "grep" ? > > Hi, > > What functions should I use in order to perform the following steps: > > 1) Load a particular column (e.g., column 5) from a csv file > 2) Append the column 5 to another csv file > 3) select those rows that match specific keywords in column 5 > > [[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. > ______________________________________________ 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.
