Try this: > L <- list(data.frame(A=2, B=3, C=4), + data.frame(A=2, B=1, C=3, D=2, E=4, F=5), + data.frame(A=1, B=2, C=4, D=3, E=2, F=4, G=5, H=4, I=2))
> library(plyr) > do.call(rbind.fill, L) A B C D E F G H I 1 2 3 4 NA NA NA NA NA NA 2 2 1 3 2 4 5 NA NA NA 3 1 2 4 3 2 4 5 4 2 On Fri, Dec 19, 2008 at 5:48 PM, Dimitri Liakhovitski <ld7...@gmail.com> wrote: > Hello, everyone! > > I have list L that contains 99 data frames. All data frames have only > one row, but a different number of columns. Some data frames have 3 > columns, some - 6 columns, and some - 9 columns. The names of the > first 3 columns are identical in all 99 data frames (e.g., A, B, and > C). The names of columns 4:6 are identical in data frames that contain > 6 and 9 columns (e.g., D, E, and F). So that L looks like this: > > L[[1]] > A B C > 2 3 4 > L[[2]] > A B C D E F > 2 1 3 2 4 5 > L[[3]] > A B C D E F G H I > 1 2 4 3 2 4 5 4 2 > L[[4]] > ... > > > How can I merge all of those data frames into one large data frame - > with 99 rows - such that all data are in the columns with correct > names. Of course, I'd like the rows of the new large data frame that > contain the data for less than 9 columns to have NAs in columns 4:9 > (or 7:9). > In other words, I want the first 3 rows of the new large data frame to > look like this: > A B C D E F G H I > 2 3 4 NA NA NA NA NA NA > 2 1 3 2 4 5 NA NA NA > 1 2 4 3 2 4 5 4 2 > > Ideally, I'd like this merge to work for ANY number of individual > small data frames in L - even if their total number within L is > unknown. > > I tried merge - but it seems to me that it only works for 2 data > frames, not for many. > Thank you very much! > -- > Dimitri Liakhovitski > MarketTools, Inc. > > ______________________________________________ > 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. > ______________________________________________ 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.