[R] ggplot2: legend

[John Kane]

I played around with this for a while with no success at all. I'd suggest posting the question on the ggplot2 newsgroup in Google Groups

John Kane
Kingston ON Canada


> -----Original Message-----
> From: thorn.thaler at rdls.nestle.com
> Sent: Tue, 3 Jul 2012 18:50:52 +0200
> To: r-help at r-project.org
> Subject: [R] ggplot2: legend
> 
> Dear all,
> 
> I produced the following graph with ggplot which is almost fine, yet I
> don't like that the legend for "Means" and "Observations" includes a
> line, though no line is used in the plot for those two (the line for
> "Overall Mean" on the other hand is wanted):
> 
> library(ggplot2)
> ddf <- data.frame(x = factor(rep(LETTERS[1:2], 5)), y = rnorm(10))
> p <- ggplot(ddf, aes(x = x, y = y))
> p + geom_point(aes(colour="Observations", shape="Observations")) +
>     stat_summary(aes(colour = "Means", shape ="Means"),
>                  fun.y = mean, fun.ymin = min, fun.ymax = max,
>                  geom = "point") +
>     geom_hline(aes(yintercept = mean(y), linetype = "Overall Mean"),
> show_guide = TRUE)
> 
> I tried to map the linetype in geom_point (and stat_summary) to NULL and
> I tried to set it to "blank" but neither worked.
> 
> Is it furthermore possible to combine the two legends? My preferred plot
> would have two symbols with different colours and shapes for "Means" and
> "Observations" (but no line) and directly below that a line for "Overall
> Mean" (that is all the three items in one legend)? For that I tried to
> assign the same names to the legends but this did not work either.
> 
> So any help would be highly appreciated.
> 
> Kind Regards,
> 
> Thorn Thaler
> Mathematician
> 
> Applied Mathematics
> Nestec Ltd,
> Nestlé Research Center
> PO Box 44
> CH-1000 Lausanne 26
> Phone: +41 21 785 8220
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> 
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