This is not a bug, and BTW data frames have names not colnames. As I have said already today, don't confuse the printed repesentation of an object with the object itself.
On Tue, 17 Aug 2004, Arne Henningsen wrote: > I am using R 1.9.1 on on i686 PC with SuSE Linux 9.0. > > I have a data.frame, e.g.: > > > myData <- data.frame( var1 = c( 1:4 ), var2 = c (5:8 ) ) > > If I add a new column by > > > myData$var3 <- myData[ , "var1" ] + myData[ , "var2" ] > > everything is fine, but if I omit the commas: > > > myData$var4 <- myData[ "var1" ] + myData[ "var2" ] > > the name shown above the 4th column is not "var4": > > > myData > var1 var2 var3 var1 > 1 1 5 6 6 > 2 2 6 8 8 > 3 3 7 10 10 > 4 4 8 12 12 > > but names() and colnames() return the expected name: > > > names( myData ) > [1] "var1" "var2" "var3" "var4" > > colnames( myData ) > [1] "var1" "var2" "var3" "var4" > > And it is even worse: I am not able to change the name shown above the 4th > column: > > names( myData )[ 4 ] <- "var5" > > myData > var1 var2 var3 var1 > 1 1 5 6 6 > 2 2 6 8 8 > 3 3 7 10 10 > 4 4 8 12 12 > > I guess that this is a bug, isn't it? No. Take a look at the fourth column more carefully. > myData[4] var1 1 6 2 8 3 10 4 12 > class(myData[4]) [1] "data.frame" You included a single-column data frame in your data frame. -- 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html