Hi Dimitri, The argument names may have changed. Notice that melt.data.frame(smiths, measured = c("age", "weight", "height"))
gives a message saying "Using subject as id variables". This is because measured variables need to be specified as measure.vars (or an abbreviation of that: even m will work because no other arguments start with m). > args(melt.data.frame) function (data, id.vars, measure.vars, variable_name = "variable", na.rm = !preserve.na, preserve.na = TRUE, ...) Bottom line: you need something like melt.data.frame(smiths, measure.vars = c("age", "weight", "height")) Best, Ista On Tue, Oct 5, 2010 at 11:36 AM, Dimitri Liakhovitski <dimitri.liakhovit...@gmail.com> wrote: > Hellow! > > I am replicating the example givien in "Reshaping Data with the > reshape Package" (http://www.jstatsoft.org/v21/i12 - see "download" > link on the right), p. 2-3. > > library(reshape) > data(smiths) > str(smiths) > > The text says: "If you specify only one of measured and identifier > variables, melt assumes that all the other variables are the OTHER > sort:" > Hence, the result of the following 5 lines should be identical: > > melt.data.frame(smiths, id = c("subject", "time"), measured = c("age", > "weight","height")) > melt.data.frame(smiths, id = c("subject", "time")) > melt.data.frame(smiths, id = 1:2) > melt.data.frame(smiths, measured = c("age", "weight", "height")) > melt.data.frame(smiths) # If you do not specify them > explicitly, melt will assume that any factor or character variables > are id variables > > > However, only the first 3 lines produce the same result. > I am especially surprised why line 4 uses "time" as a measured > variable, while it should be clear to reshape that "time" is NOT a > measured variable? > > > Thank you! > -- > Dimitri Liakhovitski > Ninah Consulting > www.ninah.com > > ______________________________________________ > 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. > -- Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org ______________________________________________ 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.