Steve ?merge
and the all collection of arguments Peter Alspach > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Steve Murray > Sent: Friday, 18 July 2008 8:43 a.m. > To: r-help@r-project.org > Subject: [R] Matching Up Values > > > Dear all, > > I have two files, both of similar formats. In column 1 are > Latitude values (real numbers, e.g. -179.25), column 2 has > Longitude values (also real numbers) and in one of the files, > column 3 has Population Density values (integers); there is > no column 3 in the other file. > > However, the main difference between these two files is that > one has fewer rows than the other. So what I'm looking to do > is, 'pad out' the shorter file, by adding in the rows with > those that are 'missing' from the longer file (ie. if a > particular coordinate isn't present in the shorter file but > is in the 'longer/master' file), and having 'zero' as its > Population Density value (column C). > > This should result in the shorter file becoming the same > length as the initially longer file, and with each file > having the same coordinate values (latitude and longitude on > each line). > > How would I do this in R? > > Thanks for any help offered, > > Steve > > _________________________________________________________________ > The John Lewis Clearance - save up to 50% with FREE delivery > > ______________________________________________ > 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. > The contents of this e-mail are privileged and/or confidential to the named recipient and are not to be used by any other person and/or organisation. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. ______________________________________________ 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.