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 > > > ------------------------------------------------------------------------ > ATTENTION: > > This message contains privileged and confidential information intended > for the addressee(s) only. If this message was sent to you in error, > you must not disseminate, copy or take any action in reliance on it and > we request that you notify the sender immediately by return email. > > Opinions expressed in this message and any attachments are not > necessarily those held by the Health and Safety Laboratory or any person > connected with the organisation, save those by whom the opinions were > expressed. > > Please note that any messages sent or received by the Health and Safety > Laboratory email system may be monitored and stored in an information > retrieval system. > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------ > This e-mail message has been scanned for Viruses and Content and cleared > by NetIQ MailMarshal > ------------------------------------------------------------------------ > ______________________________________________ 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.
