On 11/7/06, Denis Chabot <[EMAIL PROTECTED]> wrote: > Dear list members, > > I have to combine dataframes together. However they contain different > numbers of variables. It is possible that all the variables in the > dataframe with fewer variables are contained in the dataframe with > more variables, though it is not always the case. > > There are key variables identifying observations. These could be used > in a merge statement, although this won't quite work for me (see below). > > I was hoping to find a way to combine dataframes where I needed only > to ensure the key variables were present. The total number of > variables in the final dataframe would be the total number of > different variables in both initial dataframes. Variables that were > absent in one dataframe would automatically get missing values in the > joint dataframe.
Have a look at rbind.fill in the reshape package. library(reshape) rbind.fill(data.frame(a=1), data.frame(b=2)) rbind.fill(data.frame(a=1), data.frame(a=2, b=2)) Hadley ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
