[R] ggplot add a legend?

[Jeff Newmiller]

Ask on the ggplot mailing list?

Normally you use melted data (see the reshape2 package) and let the scales feature build the legend for you.
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Sent from my phone. Please excuse my brevity.

jcrosbie <james at 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> 
>
>
>
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