[R] accessing a data frame with row names

[Ivan Calandra]

Hi,

Let's create your data.frame:
 > dataframe <- structure(list(column1 = c(0.1, 0.3), column2 = c(0.2, 
0.4)), .Names = c("column1",
"column2"), row.names = c("row1", "row2"), class = "data.frame")
 > dataframe[,2]
[1] 0.2 0.4
 > dataframe[,2, drop=FALSE]
      column2
row1     0.2
row2     0.4

So I don't know what's wrong with your data.
Maybe, providing the output from str(dataframe) would help us to help you!

HTH,
Ivan

Le 5/31/2010 13:23, e-letter a écrit :
> Readers,
>
> I have entered a file into r:
>
> ,column1,column2
> row1,0.1,0.2
> row2,0.3,0.4
>
> using the command:
>
> dataframe<-read.table("/path/to/file.csv",header=T,row.names=1)
>
> When I try the command:
>
> dataframe[,2]
>
> I receive the response:
>
> NULL
>
> I was expecting:
>
> row1 0.2
> row2 0.4
>
> What is my error with the syntax please?
>
> Yours,
>
> r251
> mandriva2009
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>    

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

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