Appending the column names
You can't always get what you want (a data.frame with two sets of column headings), but you do have several options. Maybe they will help you think about what you are trying to do. Given X and Y as Arun provided earlier, you can create Z
Z <- rbind(X,colnames(Y),Y) Z
Summary G Y R 1 Acc 12 12 13 2 Bcc 11 14 15 3 Ccc 13 15 16 4 Summary G Y R 5 Acc 10 11 12 6 Bcc 13 12 11 7 Ccc 11 16 20 Which is a data.frame, but all the variables are character and the second set of column headings is just row #4. Or a list consisting of two data.frames
ListXY <- list(X=X, Y=Y) ListXY
$X Summary G Y R 1 Acc 12 12 13 2 Bcc 11 14 15 3 Ccc 13 15 16 $Y Summary G Y R 1 Acc 10 11 12 2 Bcc 13 12 11 3 Ccc 11 16 20 Now each data.frame is preserved as a member of the list ListXY. Or a single data frame that keeps track of where each row comes from by adding a column called Group:
DataXY <- rbind(data.frame(Group="X", X), data.frame(Group="Y", Y)) DataXY
Group Summary G Y R 1 X Acc 12 12 13 2 X Bcc 11 14 15 3 X Ccc 13 15 16 4 Y Acc 10 11 12 5 Y Bcc 13 12 11 6 Y Ccc 11 16 20 You just might find that one of these is what you need. ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- project.org] On Behalf Of R. Michael Weylandt Sent: Monday, July 30, 2012 3:42 PM To: namit Cc: r-help at r-project.org Subject: Re: [R] Appending the column names On Mon, Jul 30, 2012 at 3:17 PM, namit <saileshchowdary at gmail.com> wrote:
Hi Freinds, I have two data frames X,Y. I want to append both the data frames
into one,
along with the columns names from both the data frames (it should
look like
Z).
X:
Summary G Y R
Acc 12 12 13
Bcc 11 14 15
Ccc 13 15 16
Y:
Summary G Y R
Acc 10 11 12
Bcc 13 12 11
Ccc 11 16 20
Result
----------
Z:
Summary G Y R
Acc 12 12 13
Bcc 11 14 15
Ccc 13 15 16
Summary G Y R
Acc 10 11 12
Bcc 13 12 11
Ccc 11 16 20
Can anyone help me on this.
No, as noted to you by me before (https://stat.ethz.ch/pipermail/r-help/2012-July/319868.html) -- a data frame, by definition, has a single column name per column. It also must have unique rownames so your "desired output" is simply not a data frame and thus no one can help you to construct one. Now, to repeat myself: What are you trying to do (big picture wise)? R's data structures are quite flexible and powerful and it's very easy to build one to fit your needs, but what are those needs? We cannot know if you don't tell us. Michael
Thanks in Advance. Thanks, Namit. Arun your logic is not working,getting error message(could not find function"Colnames") -- View this message in context:
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______________________________________________ R-help at 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.