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
