[R] Legend in ggplot2
Federico Lasa
felasa at gmail.com
Thu Aug 7 23:55:50 CEST 2014
The problem is that you are not actually 'mapping' any variables to
the fill and colour aestethics so ggplot wont produce legends for
those. I'm not sure ggplots are appropiate for what you're trying to
do here but you can sure hack around it a bit, for instance try:
ggplot(tabu, aes(x=weeks, y=T))+
scale_y_continuous(expand=c(0,0),
minor_breaks=seq(round(min(tabu$cusums,tabu$Tupper,tabu$Tlower)),
round(max(tabu$cusums,tabu$Tupper,tabu$Tlower)),
1),
breaks=seq(round(min(tabu$cusums,tabu$Tupper,tabu$Tlower)),
round(max(tabu$cusums,tabu$Tupper,tabu$Tlower)),
2))+
scale_x_discrete(expand=c(0,0),
breaks=seq(min(tabu$weeks),
max(tabu$weeks)))+
geom_bar(data=tabu, aes(y=Tupper, fill="Tupper"),stat="identity")+
geom_point(aes(y=cusums, colour="Cusum"),size=4,pch=15)+
geom_bar(data=tabu, aes(y=Tlower, fill="Tlower"),stat="identity")+
geom_hline(aes(yintercept=0),colour="gray20",size=1)+
geom_hline(aes(yintercept=5),colour="darkorchid4",size=2,alpha=1/2)+
geom_hline(aes(yintercept=-5),colour="darkorchid4",size=2,alpha=1/2)+
geom_hline(aes(yintercept=0.5),colour="gold2",size=2,alpha=1/1.3)+
geom_hline(aes(yintercept=-0.5),colour="gold2",size=2,alpha=1/1.3)+
scale_fill_manual(name="Legend",
breaks=c("Tupper","Tlower"),
values=c("brown3","darkolivegreen4"),
labels=c("T","L"))+
scale_colour_manual(name="Legend",
breaks=c("Cusum"),
values=c("dodgerblue1"),
labels=c("Cusum"))
and fill in the balnks
P.S. your plot is very strange.
On Thu, Aug 7, 2014 at 9:07 AM, Pavneet Arora
<pavneet.arora at uk.rsagroup.com> wrote:
> Hi All
>
> Following is my dataset.
> dput(tabu)
> structure(list(weeks = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
> 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
> 29, 30), values = c(9.45, 7.99, 9.29, 11.66, 12.16, 10.18, 8.04,
> 11.46, 9.2, 10.34, 9.03, 11.47, 10.51, 9.4, 10.08, 9.37, 10.62,
> 10.31, 10, 13, 10.9, 9.33, 12.29, 11.5, 10.6, 11.08, 10.38, 11.62,
> 11.31, 10.52), deviation = c(-0.550000000000001, -2.01,
> -0.710000000000001,
> 1.66, 2.16, 0.18, -1.96, 1.46, -0.800000000000001, 0.34,
> -0.970000000000001,
> 1.47, 0.51, -0.6, 0.0800000000000001, -0.630000000000001,
> 0.619999999999999,
> 0.31, 0, 3, 0.9, -0.67, 2.29, 1.5, 0.6, 1.08, 0.380000000000001,
> 1.62, 1.31, 0.52), cusums = c(-0.550000000000001, -2.56, -3.27,
> -1.61, 0.549999999999999, 0.729999999999999, -1.23, 0.229999999999999,
> -0.570000000000002, -0.230000000000002, -1.2, 0.269999999999998,
> 0.779999999999998, 0.179999999999998, 0.259999999999998,
> -0.370000000000003,
> 0.249999999999996, 0.559999999999997, 0.559999999999997, 3.56,
> 4.46, 3.79, 6.08, 7.58, 8.18, 9.26, 9.64, 11.26, 12.57, 13.09
> ), Tupper = c(0, 0, 0, 1.16, 2.82, 2.5, 0.0399999999999991, 1,
> 0, 0, 0, 0.970000000000001, 0.98, 0, 0, 0, 0.119999999999999,
> 0, 0, 2.5, 2.9, 1.73, 3.52, 4.52, 4.62, 5.2, 5.08, 6.2, 7.01,
> 7.03), Tlower = c(-0.0500000000000007, -1.56, -1.77, 0, 0, 0,
> -1.46, 0, -0.300000000000001, 0, -0.470000000000001, 0, 0,
> -0.0999999999999996,
> 0, -0.130000000000001, 0, 0, 0, 0, 0, -0.17, 0, 0, 0, 0, 0, 0,
> 0, 0)), .Names = c("weeks", "values", "deviation", "cusums",
> "Tupper", "Tlower"), row.names = c(NA, -30L), class = "data.frame")
>
> I have created a plot using ggplot, whereby it makes both barchart and
> plots points, like following:
> ggplot(tabu,aes(x=week,
> ymin=min(tabu$cusums,tabu$Tupper,tabu$Tlower),
> ymax=max(tabu$cusums,tabu$Tupper,tabu$Tlower)))+
> labs(x=NULL,y=NULL)+
> scale_y_continuous(expand=c(0,0),
> minor_breaks=seq(round(min(tabu$cusums,tabu$Tupper,tabu$Tlower)),
> round(max(tabu$cusums,tabu$Tupper,tabu$Tlower)),
> 1),
> breaks=seq(round(min(tabu$cusums,tabu$Tupper,tabu$Tlower)),
> round(max(tabu$cusums,tabu$Tupper,tabu$Tlower)),
> 2))+
> scale_x_discrete(expand=c(0,0),
> breaks=seq(min(tabu$week),
> max(tabu$week)))+
> geom_bar(aes(y=tabu$Tupper),stat="identity",fill="brown3")+
> geom_bar(aes(y=tabu$Tlower),stat="identity",fill="darkolivegreen4")+
> geom_point(aes(y=tabu$cusums),size=4,pch=15,colour="dodgerblue1")+
> geom_hline(aes(yintercept=0),colour="gray20",size=1)+ #geom_hline -
> draws a reference line at 0
> geom_hline(aes(yintercept=5),colour="darkorchid4",size=2,alpha=1/2)+
> #Out-Of-Signal Lines
> geom_hline(aes(yintercept=-5),colour="darkorchid4",size=2,alpha=1/2)+
> #Out-Of-Signal Lines
> geom_hline(aes(yintercept=0.5),colour="gold2",size=2,alpha=1/1.3)+ #K
> geom_hline(aes(yintercept=-0.5),colour="gold2",size=2,alpha=1/1.3)+ #K
> scale_color_manual(name="Legend",
> breaks=c("Tupper","Tlower","CuSum","±K","±H"),
> values=c("brown3","darkolivegreen4","dodgerblue1","gold2","darkorchid4"),
> labels=c("T","L","C","±K","±H"))
>
> However, I am having trouble getting a legend. I know its supposed to do
> something with melt function in reshape package. But I can?t get it too
> work! Can someone please help me with this.
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