Try this: lapply(list(letters[1:3], letters[2:4]), function(x)apply(df[,x], 1, sd))
On 28/02/2008, Albert Vilella <[EMAIL PROTECTED]> wrote: > Hi, > > I've got a dataframe like this: > > df = > data.frame(a=rnorm(100,1),b=rnorm(100,10),c=rnorm(100,100),d=rnorm(100,-100)) > > and I want to calculate sd1 for (a,b,c) for each entry, and sd2 for > (b,c,d) for each entry. > > I don't seem to find the answer using aggregate or apply, > > How can I do this? > > Thanks in advance, > > Cheers, > > Albert. > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.
