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How to change all name of variables

4 messages · Muhammad Subianto, Sean Davis, Gabor Grothendieck

Original
Muhammad Subianto
# 
Dear R-helpers,
First I apologize if my question is quite simple
I have a large datasets which more 100 variables.
For a research I need to change all name of variables with add one or
more letters on each variables.
For example,
 > data(Pima.tr)
 > Pima.tr[1:5,]
   npreg glu bp skin  bmi   ped age type
1     5  86 68   28 30.2 0.364  24   No
2     7 195 70   33 25.1 0.163  55  Yes
3     5  77 82   41 35.8 0.156  35   No
4     0 165 76   43 47.9 0.259  26   No
5     0 107 60   25 26.4 0.133  23   No
 >
 > dimnames(Pima.tr)[[2]]
[1] "npreg" "glu"   "bp"    "skin"  "bmi"   "ped"   "age"   "type"
 >

I need to change the variables name ,
"npreg" "glu" "bp" "skin" "bmi" "ped" "age" "type"
with
"xyz.npreg" "xyz.glu" "xyz.bp" "xyz.skin" "xyz.bmi" "xyz.ped" "xyz.age" 
"xyz.type"

How can I make this (automatically). I don't want to make manual with 
more 100 variables.
I  would be very happy if anyone could help me.
Thank you for your time.
Kindly regards, Muhammad Subianto
Sean Davis
# 
See ?paste.

Something like below if you have 100 column names:

dimnames(pima.tr)[[2]] <- 
paste(rep('xyz',100),dimnames(pima.tr)[[2]],sep=".")

You probably want to test the paste statement before setting the 
dimnames, or operate on a copy of the data until you get the hang of 
using paste.

Sean
On Jun 2, 2005, at 7:04 AM, Muhammad Subianto wrote:

            

      
      
      
    

        

      
      
    

  
  


  


      

    

    

      
      

        


  

        

      Gabor Grothendieck
    

    

      
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On 6/2/05, Muhammad Subianto <subianto at gmail.com> wrote:

            

      
      
      
    

        
Try this:

names(prima) <- paste("xyz", names(prima), sep = ".")

  
  


  


      

    

    

      
      

        


  

        

      Muhammad Subianto
    

    

      
      #
    

  


  

      
Dear all R-helpers,
Thanks you very much for your help. I would like to thanks Sean Davis 
and Gabor Grothendieck for their help.
Best wishes, Muhammad Subianto

        
On this day 6/2/2005 3:21 PM, Gabor Grothendieck wrote:

        
>
 > Try this:
 >
 > names(prima) <- paste("xyz", names(prima), sep = ".")
 >

        
On this day 6/2/2005 1:20 PM, Sean Davis wrote:

        
> See ?paste.
 >
 > Something like below if you have 100 column names:
 >
 > dimnames(pima.tr)[[2]] <-
 > paste(rep('xyz',100),dimnames(pima.tr)[[2]],sep=".")
 >
 > You probably want to test the paste statement before setting the
 > dimnames, or operate on a copy of the data until you get the hang of
 > using paste.
 >
 > Sean

        
On this day 6/2/2005 1:04 PM, Muhammad Subianto wrote: