shouldKeep <- sapply(listOfDataFrames, function(df)nrow(df)>1) listOfDataFrames[shouldKeep] or, compressed to get rid of the intermediate variable listOfDataFrames[sapply(listOfDataFrames, function(df)nrow(df)>1)]
If you are writing production code and there is any chance that listOfDataFrames might be an empty list you can use vapply (which requires that you supply a prototype for FUN's return value): listOfDataFrames[vapply(listOfDataFrames, function(df)nrow(df)>1, FUN.VALUE=FALSE)] Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Lara Poplarski > Sent: Tuesday, May 17, 2011 1:25 PM > To: r-help@r-project.org > Subject: [R] subsetting a list of dataframes > > Hello All, > > I have a list of dataframes, and I need to subset it by > keeping only those > dataframes in the list that meet a certain criterion. > Specifically, I need > to generate a second list which only includes those > dataframes whose number > of rows is > 1. > > Could someone suggest how to do this? I have come close to > what I need with > loops and such, but there must be a less clumsy way... > > Many thanks, > Lara > > [[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.
