Thanks. It works very good.
Chi

On Thu, Jul 12, 2012 at 7:27 PM, arun <smartpink111@yahoo.com> wrote:

> Hello,
>
> I saw your reply in nabble.  Sorry about that.  I thought the dataset had
> only few columns.
>
> #You can read first line of a file using:
> readLines("foo.txt",n=1)[1]
>
>
> #The more generic colname substitution
> dat1<-read.table(text="
>  2.5  3.6  7.1  7.9
>  100  3      4      2    3
>  200  3.1  4      3      3
>  300  2.2  3.3  2    4
>  ",sep="",header=TRUE)
> #The code should remove the "X" from the column names (row names?)
>
> colnames(dat1)<-gsub("^[X](.*)","\\1",colnames(dat1))
> dat1
>     2.5 3.6 7.1 7.9
> 100 3.0 4.0   2   3
> 200 3.1 4.0   3   3
> 300 2.2 3.3   2   4
>
> plot(colMeans(dat1)~as.numeric(names(dat1)),xlab="Column_Name",ylab="Column_Mean")
>
> A.K.
>
>
>
>
> ----- Original Message -----
> From: kexinz <zhangchicool@gmail.com>
> To: r-help@r-project.org
> Cc:
> Sent: Thursday, July 12, 2012 2:50 PM
> Subject: [R] read.table with numeric row names
>
> I have a text file like this
>          2.5  3.6  7.1  7.9
> 100   3      4       2     3
> 200   3.1   4      3      3
> 300   2.2   3.3   2     4
>
> I used "r <- read.table("a.txt", header=T)"
> The row names becomes X2.5, X3.6... What I need is the row names are
> numeric, so I can use the row names as numbers on x-axis for plotting. e.g.
> "plot(colMeans(r)~names(r))", something like this. How to do this?
>
> Thanks.
>
>
>

	[[alternative HTML version deleted]]

