[R] How to change all name of variables

[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:

> 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
>
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