On Wed, 20 Jul 2005 [EMAIL PROTECTED] wrote: > > Hi, > > I would like to add a prefix to colnames in a matrix but I can't get the > prefix > option in colnames to work. What am I doing wrong? > >> X<-matrix(NA,3,4) >> colnames(X)<-c("test","test","test","test") >> colnames(X)<-colnames(X,prefix="PREFIX.") >> X > test test test test > [1,] NA NA NA NA > [2,] NA NA NA NA > [3,] NA NA NA NA > > ?? I also tried with do.NULL set to FALSE but it still does not work.
The help page is your friend here: do.NULL: logical. Should this create names if they are 'NULL'? prefix: for created names. If 'do.NULL' is 'FALSE', a character vector (of length 'NROW(x)' or 'NCOL(x)') is returned in any case, prepending 'prefix' to simple numbers, if there are no dimnames or the corresponding ^^^^^^^^^^^^^^^^^^^^^^^^ component of the dimnames is 'NULL'. so > X < -matrix(NA,3,4) > colnames(X,prefix="PREFIX.", do.NULL=FALSE) [1] "PREFIX.1" "PREFIX.2" "PREFIX.3" "PREFIX.4" works as documented. -- Brian D. Ripley, [EMAIL PROTECTED] 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@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