R help - Sep 2012 - How to Rename Column Labels?

Hi,

How do I rename the column labels in the table?

For Instance, if I have a table like this, and I want to have the column labels
changed from "A1 A2 A3 A4 A5" to "Mike Kate Michelle Paul
Young"

      A1     A2     A3    A4    A5
1  33    44      55      66    77
2
3
4
5
6
7
7
8
9

and my text file location is: ""/Users/MAC/Desktop/data.txt"

When I type in colnames(data.txt)[1] <- "Income", I get an error
message saying "target of assignment expands to non-language object".

Thanks!

You can't do that on disk - try:
> dfr <- read.table ( "/Users/MAC/Desktop/data.txt" )
> dfr
  A1 A2 A3 A4 A5
1 33 44 55 66 77   
                                                                                
> colnames( dfr ) <- c( "Mike", "Kate",
"Michelle", "Paul", "Young" )
> dfr
  Mike Kate Michelle Paul Young
1   33   44       55   66    77      
                                                                 
> write.table( dfr, "/Users/MAC/Desktop/data.txt" )  
Rgds,
Rainer 
 





On Friday 07 September 2012 22:54:32 Youn Se Hwan wrote:
> Hi,
> 
> How do I rename the column labels in the table?
> 
> For Instance, if I have a table like this, and I want to have the column
labels changed from "A1 A2 A3 A4 A5" to "Mike Kate Michelle Paul
Young"
> 
>       A1     A2     A3    A4    A5
> 1  33    44      55      66    77
> 2
> 3
> 4
> 5
> 6
> 7
> 7
> 8
> 9
> 
> and my text file location is: ""/Users/MAC/Desktop/data.txt"
> 
> When I type in colnames(data.txt)[1] <- "Income", I get an
error message saying "target of assignment expands to non-language
object".
> 
> Thanks!
> 
> ______________________________________________
> 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.

- - - - -

Boycott Apple!

You seem to be trying to do something from the file on disk and you want to do
it to the table in the R environment.

Example of what you probably want 
mydata  <-  sample(c("A1", "A2", "A3",
"A4", "A5"), 45, replace = TRUE)
mytable  <-  table(mydata)
mytable
names(mytable)  <-  c("Mike", "Kate",
"Michelle",  "Paul Young")
mytable

John Kane
Kingston ON Canada

> -----Original Message-----
> From: youn.sehwan at gmail.com
> Sent: Fri, 7 Sep 2012 22:54:32 -0400
> To: r-help at r-project.org
> Subject: [R] How to Rename Column Labels?
> 
> Hi,
> 
> How do I rename the column labels in the table?
> 
> For Instance, if I have a table like this, and I want to have the column
> labels changed from "A1 A2 A3 A4 A5" to "Mike Kate Michelle
Paul Young"
> 
>       A1     A2     A3    A4    A5
> 1  33    44      55      66    77
> 2
> 3
> 4
> 5
> 6
> 7
> 7
> 8
> 9
> 
> and my text file location is: ""/Users/MAC/Desktop/data.txt"
> 
> When I type in colnames(data.txt)[1] <- "Income", I get an
error message
> saying "target of assignment expands to non-language object".
> 
> Thanks!
> 
> ______________________________________________
> 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.
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