Adding simple legend to plot in R

Question

I would like to create a very simple plot. I am using this data:

a <- read.table(\"https://dl.dropbox.com/u/22681355/a.csv\", sep=\',\', header=TRUE)

pl         


        

Answer 1

Take a look at ?legend and try this:

legend('topright', names(a)[-1] , 
   lty=1, col=c('red', 'blue', 'green',' brown'), bty='n', cex=.75)