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POLegend with subgroups in ggplot2
 

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  1. POLegend with subgroups in ggplot2
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    <p>I want to plot the following dataset:</p> <pre><code>data&lt;-list() data$Year&lt;-c(rep(1995,4),rep(2005,4)) data$Name&lt;-as.factor(c("name1","name2","name3","name4","name1","name2","name3","name4")) data$species&lt;-as.factor(c("cat","cat","dog","dog","cat","cat","dog","dog")) data$Value&lt;-c(1,2,3,4,5,6,7,8) data&lt;-as.data.frame(data) </code></pre> <p>This is my desired plot</p> <pre><code>p&lt;-ggplot(data, aes(x=Year, y=Value,fill=Name, colour=Name,linetype=species,shape=species)) p&lt;-p+geom_point() p&lt;-p+geom_line() </code></pre> <p>I want a different legend however. First, the legend should contain one entry for each 'name' with the correct symbol(color, linetype and shape). I can achieve this by doing the following (the linetypes do not exactly match, sorry):</p> <pre><code>#Plot with better legend gg_color_hue &lt;- function(n) { hues = seq(15, 375, length=n+1) hcl(h=hues, l=65, c=100)[1:n] } p2&lt;-ggplot(data, aes(x=Year, y=Value,fill=Name, colour=Name,linetype=Name,shape=Name)) p2&lt;-p2+scale_linetype_manual(values=c(1,1,2,2),breaks=levels(data$Name),name="test") p2&lt;-p2+scale_shape_manual(values=c(16,16,17,17),breaks=levels(data$Name),name="test") p2&lt;-p2+scale_colour_manual(values=gg_color_hue(4),breaks=levels(data$Name),name="test") p2&lt;-p2+scale_fill_manual(values=gg_color_hue(4),breaks=levels(data$Name),name="test") p2&lt;-p2+geom_point(show_guide=T) p2&lt;-p2+geom_line(show_guide=T) </code></pre> <p>Now however there is no distinction between cats and dogs anymore. Therefore I would like to have subtitles in the legend (or essentially two legends): Something like this:</p> <pre><code>cats symbol(name1) name1 symbol(name2) name2 dogs symbol(name3) name3 symbol(name4) name4 </code></pre> <p>Can somebody help me on this? Thank you.</p>
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    1. USGavin Simpson
    1. USuser2215127
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      1. LTLinked
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    1. COMaybe you can addapt [this solution](http://stackoverflow.com/questions/15462203/modify-legend-in-facetted-plot-ggplot2/15463216#15463216)
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      1. POLegend with subgroups in ggplot2
      1. USDidzis Elferts
    2. COThat does it, thank you very much.
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      1. POLegend with subgroups in ggplot2
      1. USuser2215127
 

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