On Sat, 27 Oct 2007, Michael Kubovy wrote:
Dear R-helpers,
I'm trying to selectively swap labels between two factors, depending
on an indicator variable i.
Can you point me to a solution, and perhaps how I could have found it?
labels(fact1) is a character vector of r row numbers
labels( object, ... )
is a generic function. See ?labels
I do not know of any method (e.g. 'methods( labels )' ) that returns a
character vector of 'row numbers'. So, this is either your own method, a
function that masks base:::labels(), or a misstatement about what labels()
does.
levels(fact1) is a character vector of the n r unique levels
How do I then get the character vector of length r of the levels of
fact1?
as.character( fact1 )
Once I have that, is there anything else I need to know about
swapping labels between factors in a df?
Would a 'df' be a data.frame object?
Do you mean swapping 'levels'? There is no 'labels' attribute of a factor
in a data.frame or elsewhere.
If you mean to swap elements of two vectors that happen to be factors, the
path of least resistance and confusion is likely to convert both to
character vectors, perform the changes, then convert both to factors, and
finally replace the orignals with the new versions.
Chuck
_
Professor Michael Kubovy
University of Virginia
Department of Psychology
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