On 15/03/2011, Francisco Gochez <fjgoc...@googlemail.com> wrote: > Hi, > > What you are after is: > > datasubset <- dataset[ dataset[,3] == "text3", ]
Thank you. For the set text1,23,text2,45 text1,23,text3,78 text1,23,text3,56 text1,23,text2,45 Is it possible to write a function that selects rows containing 'text3' and applies the function 'sum' to values '78' and '56'? The control statements described in the document 'an introduction to r' (Venables and Smith, 2010) suggest that the if statement would return 'true', to prevent a sum function being applied to 'true' results. ______________________________________________ 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.
