Probably, I should read emails more carefully... sorry!!! Of course, this solves my problem.
Thank you very much! Charilaos Skiadas schrieb: > Did you try Richie's suggestion? The x[,1] part will pick out the first > column of the data frame. Seems to do exactly what you asked for. > > Haris Skiadas > Department of Mathematics and Computer Science > Hanover College > > On Apr 11, 2008, at 7:57 AM, Antje wrote: > >> Of course, I know, but I cannot apply the function "density" to a data >> frame >> (which is the element of the list) but to a vector coming from a data >> frame. >> That's my problem I'd like to solve... >> >> >> >> [EMAIL PROTECTED] schrieb: >>>> I have a list which consists of data frames (all data frames have the >>> same >>>> amount and type of columns but different length). >>>> Now, I'd like to calculate for each data frame in the list the >>>> density function >>>> of the values of the fist column ($V1). >>>> >>>> This list could be an example: >>>> >>>> l <- list( data.frame(rnorm(100)), data.frame(rnorm(20)), data. >>>> frame(rnorm(200)) ) >>> >>> If you want to do the same thing to every element of a list, lapply (or >>> sapply) is your friend. >>> Try: >>> >>> lapply(l, function(x) density(x[,1])) >>> >>> Regards, >>> Richie. >>> >>> Mathematical Sciences Unit >>> HSL >>> > > > > ______________________________________________ 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.
