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rggplot2legendggbiplot

change legend title in ggbiplot

I'm having trouble manipulating ggbiplot such that I can specify what the title of the legend is. Using the package data:

library(ggbiplot)
data(wine)
wine.pca <- prcomp(wine, scale. = TRUE)
p <- ggbiplot(wine.pca, obs.scale = 1, var.scale = 1, groups = wine.class, 
              ellipse =  TRUE, circle = TRUE)

I've tried the following

p + scale_fill_discrete(name="New Title")
p + guides(fill=guide_legend(title="New Legend Title"))

but I have no luck with either. I was wondering if somebody was familiar with this package and was able to advise as to how to change the legend title.

Solution

  • As you are plotting points and their aesthetics is color and accordingly you should use color= instead of fill=

    p+guides(color=guide_legend("Legend title"))

    or

    p + labs(color="Legend title")