Thank you for your answer, Gabor. I will see, if I understood it. Heinz
At 11:31 24.05.2006 -0400, Gabor Grothendieck wrote: >You could create your own child class with its own [ method. > >"[.myfactor" <- function(x, ...) { > attr <- attributes(x) > x <- NextMethod("[") > attributes(x) <- attr > x >} > >gx <- structure(fx, class = c("myfactor", class(fx))) >attributes(gx[1]) > > >On 5/24/06, Heinz Tuechler <[EMAIL PROTECTED]> wrote: >> Dear All! >> >> For descriptive purposes I would like to add attributes to objects. These >> attributes should be kept, even if by indexing only part of the object is >> used. >> I noted that some attributes like levels and class of a factor exist also >> after indexing, while others, like comment or label vanish. >> Is there a way to make an arbitrary attribute to be kept after indexing? >> This would be especially useful when indexing a data.frame. >> >> ## example for loss of attributes >> fx <- factor(1:5, ordered=TRUE) >> attr(fx, 'comment') <- 'Comment for fx' >> attr(fx, 'label') <- 'Label for fx' >> attr(fx, 'testattribute') <- 'just for fun' >> attributes(fx) # all attributes are shown >> attributes(fx[]) # all attributes are shown >> attributes(fx[1:5]) # only levels and class are shown >> attributes(fx[1]) # only levels and class are shown >> >> Thanks, >> >> Heinz Tüchler >> >> ______________________________________________ >> R-help@stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >> > > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html