Dear Prof. Ripley, many thanks for your quick reply.
A character matrix (although clearly not very elegant) would be no problem, xtable deals with that. I tried as.data.frame() before, but if one wants to have the same rows as in ft, one has to use additional commands (?): ft # => 16 rows as.data.frame(ft) # => 32 rows; different order Is there a simple way to get the same order of the variables as in ft? Cheers, Marius On 2011-05-27, at 08:17 , Prof Brian Ripley wrote: > as.data.frame(ft) > > seems straightforward enough. > > I don't think you actually want a matrix, as they would have to be a > character matrix and the ftable object is numeric. > > On Fri, 27 May 2011, Marius Hofert wrote: > >> Dear expeRts, >> >> What's the easiest way to convert an ftable object to a matrix such that the >> row names of the ftable object are shown in the first couple of columns of >> the >> matrix? This is (typically) required, for example, when the final goal is to >> print >> the matrix via xtable. >> >> Below is a rather complicated example of how to do it... >> >> Cheers, >> >> Marius >> >> ## Goal: convert an ftable() to a (character) matrix including the row names >> of >> ## the ftable object as columns in the matrix (so that the matrix can >> be >> ## nicely printed with xtable() for example) >> (ft <- ftable(Titanic, row.vars=1:3)) # ftable object >> rn <- attr(ft, "row.vars") # pick out rownames >> rn. <- rn[length(rn):1] # unfortunately, we have to (?) change the order due >> to expand.grid() >> g <- expand.grid(rn.) # build the 3 columns containing the row names >> (g. <- g[,length(rn):1]) # change order back; now contains the same row >> names as ft >> (ft.mat <- as.matrix(ft)) # convert ftable object to a matrix >> ## now, cbind g. and ft.mat >> cbind(g., ft.mat) # => now the rownames are there twice! ... although >> dim(ft.mat)==c(16, *2*) >> ## class(g.) => okay, probably we meant: >> (res <- cbind(as.matrix(g.), ft.mat)) >> require(xtable) >> xtable(res) >> ______________________________________________ >> 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. >> > > -- > Brian D. Ripley, rip...@stats.ox.ac.uk > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ > University of Oxford, Tel: +44 1865 272861 (self) > 1 South Parks Road, +44 1865 272866 (PA) > Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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.