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POAdd legend to ggplot2 line plot
 

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  1. POAdd legend to ggplot2 line plot
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    <p>I have a question about legends in ggplot2. I managed to plot three lines in the same graph and want to add a legend with the three colors used. This is the code used</p> <pre><code>library(ggplot2) require(RCurl) link&lt;-getURL("https://dl.dropbox.com/s/ds5zp9jonznpuwb/dat.txt") datos&lt;- read.csv(textConnection(link),header=TRUE,sep=";") datos$fecha &lt;- as.POSIXct(datos[,1], format="%d/%m/%Y") temp = ggplot(data=datos,aes(x=fecha, y=TempMax,colour="1")) + geom_line(colour="red") + opts(title="TITULO") + ylab("Temperatura (C)") + xlab(" ") + scale_y_continuous(limits = c(-10,40)) + geom_line(aes(x=fecha, y=TempMedia,colour="2"),colour="green") + geom_line(aes(x=fecha, y=TempMin,colour="2"),colour="blue") + scale_colour_manual(values=c("red","green","blue")) temp </code></pre> <p>and the output</p> <p><img src="https://i.stack.imgur.com/4LqYa.png" alt="ggplot three lines"></p> <p>I'd like to add a legend with the three colours used and the name of the variable (TempMax,TempMedia and TempMin). I have tried </p> <pre><code>scale_colour_manual </code></pre> <p>but can't find the exact way.</p> <p>Unfortunately original data were deleted from linked site and could not be recovered. But they came from meteo data files with this format</p> <pre><code>"date","Tmax","Tmin","Tmed","Precip.diaria","Wmax","Wmed" 2000-07-31 00:00:00,-1.7,-1.7,-1.7,-99.9,20.4,20.4 2000-08-01 00:00:00,22.9,19,21.11,-99.9,6.3,2.83 2000-08-03 00:00:00,24.8,12.3,19.23,-99.9,6.8,3.87 2000-08-04 00:00:00,20.3,9.4,14.4,-99.9,8.3,5.29 2000-08-08 00:00:00,25.7,14.4,19.5,-99.9,7.9,3.22 2000-08-09 00:00:00,29.8,16.2,22.14,-99.9,8.5,3.27 2000-08-10 00:00:00,30,17.8,23.5,-99.9,7.7,3.61 2000-08-11 00:00:00,27.5,17,22.68,-99.9,8.8,3.85 2000-08-12 00:00:00,24,13.3,17.32,-99.9,8.4,3.49 </code></pre>
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    1. COI am still curious wether legends can be tied to seperate elements of the plot (such as different geom_line).
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      1. USEtienne Low-Décarie
    2. COIf you only have 3 lines I'd suggest looking at the dirrectlabels package. [(LINK)](http://learnr.wordpress.com/2010/01/03/directlabels-adding-direct-labels-to-ggplot2-and-lattice-plots/)
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      1. USTyler Rinker
    3. CO@TylerRinker I had used it before for other purposes but now the answer from csgillespie works better for me
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