Thanks Christos, for your reply and for sharing how to access the attributes?, slots? in a shorthand notation with @, but after reading the help for @, I became even more confused. Is there any place that has collected wisdom on R indexing?
On Thu, Mar 27, 2008 at 1:35 PM, Christos Hatzis <[EMAIL PROTECTED]> wrote: > You need to use the '@' operator to directly access attributes (not > elements) of objects: > > > [EMAIL PROTECTED] > [1] "x" "y" "z" > > > See ?'@' for more details. > > -Christos > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Tribo Laboy > > Sent: Thursday, March 27, 2008 12:16 AM > > To: r-help@r-project.org > > Subject: [R] Rule for accessing attributes? > > > > > > Hi ! > > > > I am a new user and quite confused by R-indexing. > > > > Make a list and get the attributes > > lst <- list(x = 1:3, y = 4:6, z = 7:9) > > attributes(lst) > > > > This returns: > > > > $names > > [1] "x" "y" "z" > > > > I can easily do: > > > > nm <-names(lst) > > > > or > > > > nm <-attr(lst,"names") > > > > which both return the assigned names of the named list 'lst', > > but why then this doesn't work: > > > > lst$names > > > > ? > > > > I am confused ... Moreover, I noticed that some of the objects (e.g. > > plot objects returned by ggplot) also have attributes when > > queried by the 'attributes' function, but they are accessible > > by the $ notation. > > (e.g. > > > > xydf <- data.frame(x = 1:5, y = 11:15) > > plt <- ggplot(data = xydf, aes(x = x,y = y)) + geom_point() > > attributes(plt) > > > > Now we can change the title: > > > > plt$title <- "My Title" > > plt > > > > So is it some inconsistency or am I missing something important? > > > > > > ______________________________________________ > > 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. > > > > > > > ______________________________________________ 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.
