Re: [R] Extracting "row.names"

From: Erik Iverson <>
Date: Mon, 23 Jun 2008 13:21:55 -0500

row.names is a function that takes a data.frame as an argument. So how about

 > row.names(data)


As an aside, 'data' is not the best choice for a variable name in R, since there is a function called 'data' that will get overridden if you do this ...

Patrick Richardson wrote:
> List,
> I'm trying to extract the row names of a table I have read into R.
>> data <- read.table("mesodata.txt", header=TRUE, row.names=1)
> When I try to extract them using,
>> names <- data$row.names
> I get,
>> names
> I've tried changing to a matrix, data frame, etc. and still get "NULL".
> I've checked ?row.names as well as help on extracting part of an object,
> etc. and unless I'm missing something obvious (likely), I can't figure out
> how to extract them.
> I want to extract the row names (which are basically gene id's) as well as
> some other columns (which I can do successfully) and "cbind" them into
> another data frame (which I can also do successfully). I just can't get the
> row names extracted (Assigned) to an seperate object.
> Any suggestions would be appreciated.
> Many Thanks,
> Patrick
>> sessionInfo()
> R version 2.7.0 (2008-04-22)
> i386-pc-mingw32
> locale:
> LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
> States.1252;LC_MONETARY=English_United
> States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
> mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Mon 23 Jun 2008 - 18:55:32 GMT

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