[R] read.table with numeric row names

[kexinz]

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.

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