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Appending the column names

4 messages · namit, R. Michael Weylandt, arun +1 more

namit
# 
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. 

Thanks in Advance. 

Thanks, 
Namit. 

Arun  your logic is not working,getting error message(could not find
function"Colnames")



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R. Michael Weylandt
#
On Mon, Jul 30, 2012 at 3:17 PM, namit <saileshchowdary at gmail.com> wrote:
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
arun
# 
Hello,

It's not "Colnames".? It is colnames().? Also, you should use stringsAsFactors=FALSE.

?I tried to reply it to nabble.? But, seems like nabble webpage is redirecting to some porn site.? 

Anyway,

X<-read.table(text="
??? Summary??? G????? Y???? R
????? Acc?????????????? 12??? 12?? 13
????? Bcc?????????????? 11??? 14?? 15
????? Ccc?????????????? 13??? 15?? 16
",sep="",header=TRUE,stringsAsFactors=FALSE)
Y<-read.table(text="
?? Summary??? G????? Y???? R
????? Acc?????????????? 10??? 11?? 12
????? Bcc?????????????? 13??? 12?? 11
????? Ccc?????????????? 11??? 16?? 20
",sep="",header=TRUE,stringsAsFactors=FALSE)
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

A.K.




----- Original Message -----
From: namit <saileshchowdary at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Monday, July 30, 2012 4:17 PM
Subject: [R] Appending the column names

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. 

Thanks in Advance. 

Thanks, 
Namit. 

Arun? your logic is not working,getting error message(could not find
function"Colnames")



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David L Carlson
# 
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
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
$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:
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