ggplot2 legend code example

Example 1: how to change labels on legend ggplot

scale_color_manual(values = c("#D16103", "#4E84C4"),
                     labels = c("Justin", "Myself"))

Example 2: ggplot legend size

plot + theme(legend.key.size = unit(2, "cm"))

Example 3: ggplot put legend in plot

p + theme(legend.position = c(0.8, 0.2))