Thanks Steve, this works very well! Mark
On Tue, Nov 24, 2009 at 2:07 PM, Steve Lianoglou < mailinglist.honey...@gmail.com> wrote: > Hi, > > On Nov 24, 2009, at 2:58 PM, Mark Na wrote: > > > Dear R-helpers, > > > > I have a dataframe that should not contain any negative values, but it > does. > > I wish to print the rows from my dataframe that contain a negative value > in > > any column. I've tried this: > > > >> dataframe[dataframe<0,] > > > > but it just returns a row of NAs. > > > > I would very much appreciate any help with this you could provide. > > Imagine you had a data.frame like this: > > R> df <- data.frame(a=1:10, b=c(1:3,-4, 5:10), c=c(-1, 2:10)) > > This will return you a boolean vector of which rows have negative values: > > R> has.neg <- apply(df, 1, function(row) any(row < 0)) > > If you want the actually index numbers: > R> which(has.neg) > [1] 1 4 > > HTH, > -steve > > -- > Steve Lianoglou > Graduate Student: Computational Systems Biology > | Memorial Sloan-Kettering Cancer Center > | Weill Medical College of Cornell University > Contact Info: > http://cbio.mskcc.org/~lianos/contact<http://cbio.mskcc.org/%7Elianos/contact> > > -- Mark Na University of Saskatchewan Saskatoon, Canada [[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.
