On Mon, Dec 6, 2010 at 3:58 AM, Sunny Srivastava <research.b...@gmail.com> wrote: > Dear R-Helpers: > > I am using trying to use *ddply* to extract min and max of a particular > column in a data.frame. I am using two different forms of the function: > > > ## var_name_to_split is a string -- something like "var1" which is the name > of a column in data.frame > > ddply( df, .(as.name(var_name_to_split)), function(x) c(min(x[ , 3] , max(x[ > , 3]))) ## fails with an error - case 1 > ddply( df, var_name_to_split , function(x) c(min(x[ , 3] , max(x[ , 3]))) > ## works fine - case 2 > > I can't understand why I get the error in case 1. Can someone help me > please?
Why do you expect case 1 to work? Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ______________________________________________ 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.
