On Thu, Dec 23, 2004 at 11:28:31AM -0800, Rudi Alberts wrote: > Hi, > > I often run into this problem: > I have a data.frame with one column containing entries that are not > unique. What I then want is a subset of the data.frame in which > the entries in that column have become the 'unique' of the original > column. > Normally I program around it by taking the unique of the column and > making a new data.frame with it and filling the rest of the data. > > (By the way, when moving to the smaller data.frame for example 5 rows > with the same value in that column will be replaced by one row for that > value. I don't mind which of the rows now..) > > > something like this, however, this gives me the complete df. > > df[df$colname %in% unique(df$colname),] > > or this, which doesnt work > > df[df$colname == unique(df$colname),] > Use 'duplicated':
> df[!duplicated(df$colname), ] -- G�ran Brostr�m tel: +46 90 786 5223 Department of Statistics fax: +46 90 786 6614 Ume� University http://www.stat.umu.se/egna/gb/ SE-90187 Ume�, Sweden e-mail: [EMAIL PROTECTED] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
