Map year to an aesthetic and let ggplot do it for you: df2010$year <- 2010 df2011$year <- 2011 df2012$year <- 2012 dfAll <- rbind(df2010, df2011, df2010)
ggplot(dfAll, aes(x=Price, y=percenCapacity, color=year) + scale_x_log10() Best, Ista On Mon, Dec 17, 2012 at 6:03 PM, jcrosbie <ja...@crosb.ie> wrote: > > How to I go about adding a legend to the following plot? > > ggplot() + geom_line(aes(x=df2010$Price,y=df2010$percentCapacity), colour = > "red") > + geom_line(aes(x=df2011$Price,y=df2011$percentCapacity), colour = "green") > +geom_line(aes(x=df2012$Price,y=df2012$percentCapacity), colour = "blue") > +scale_x_log10() > > > <http://r.789695.n4.nabble.com/file/n4653389/Rplot01.jpeg> > > > > -- > View this message in context: > http://r.789695.n4.nabble.com/ggplot-add-a-legend-tp4653389.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@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. ______________________________________________ R-help@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.
