Change the order of legend values in a plot in R

Question

how to change the order of legend values in a plot in R?

Answer 1

@prardhana,

Use scale_fill/color/size_discrete/contin....(labels = c()). compare both to see the difference.

Example -

ggplot(mpg, aes(displ, hwy, fill = factor(cyl))) + geom_bar(stat = "identity") + scale_fill_discrete(labels = 
c("a","b","c","d")) + theme(legend.background = element_rect(colour = "red"),plot.background = element_rect(
  color = "blue"),panel.background = element_rect(color = "green"),legend.text = element_text(color = "hotpink")
  ,legend.title = element_text(color = "pink"))

ggplot(mpg, aes(displ, hwy, fill = factor(cyl))) + geom_bar(stat = "identity") + scale_fill_discrete(labels = 
c("a","c","b","d")) + theme(legend.background = element_rect(colour = "red"),plot.background = element_rect(
  color = "blue"),panel.background = element_rect(color = "green"),legend.text = element_text(color = "hotpink")
  ,legend.title = element_text(color = "pink"))