[R] Matrix barplot

[Andreas Tille]

On Fri, 25 Jul 2008, Nutter, Benjamin wrote:

>> data <- data.frame(Year=c(2000,2001,2002),
>                     A=c(4,2,1),
>                     B=c(3,1,2),
>                     C=c(0,3,5))
>
>> data.mat <- as.matrix(data)[,2:4]
>> rownames(data.mat) <- data$Year
>> data.mat <- t(data.mat)
>> barplot(data.mat,beside=TRUE)

As I said this works great - but now I would like to use the table
heading as legend - and have no idea how to access the header (see below)
>
> -----Original Message-----
> On Behalf Of Andreas Tille
> Sent: Friday, July 25, 2008 8:14 AM
> To: r-help at r-project.org
> Subject: [R] Matrix barplot
>
>      Year      A     B    C
>      2000      4     3    0
>      2001      2     1    3
>      2002      1     2    5

What do I need to specify as legend.text in the barplot command
to get A / B / C in the legend if I read the file using

      data <- read.table(file='data.dat', sep = '\t', fill=TRUE, header=TRUE ) 
Kind regards

       Andreas.



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