putting text below a legend


I would like to be able to put text below a legend. Here is a sample that I found online:


# The label
label = "Mean of Sepal.Width = 3.05"

# The plot - Note the extra margin space for the label
myplot = ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, color=Species)) + 
    geom_line() +   
    annotate("text", x = Inf, y = 2.9, label = label, hjust = -0.08, size = 3) +
    theme(plot.margin = unit(c(.5,6,.5,.5),"lines"),
          legend.background = element_rect(colour = "black"))

# Turn off clipping to the plot panel
g = ggplotGrob(myplot)
g$layout$clip[g$layout$name == "panel"] = "off"

This is great, but you have to have the Y value. I would like to have this update automatically for the particular plot. Also, I do not need a box around the legend.

Thanks for any help!


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