How to assign a color to the rest of the values in scale_color

So this is the way that I'm setting up my own color pallette:

nice_colors <- c('orange', 'red', 'blue')
names(nice_colors) <- c("4", "2", "3")

ggplot(mtcars, aes(mpg, wt, color = factor(carb)))  
  geom_point()   scale_colour_manual(values = nice_colors, name = 'carb') theme_bw()

mtcars$carb has 6 unique factors. I'm only assigning three of those factors so the rest of the factors are in grey. I want to assign the rest as green without explicitly telling it or it showing in my legend or changing the variable values.

CodePudding user response：

Set the na.value to green.

ggplot(mtcars, aes(mpg, wt, color = factor(carb)))  
  geom_point()   scale_colour_manual(values = nice_colors, name = 'carb', na.value = "green") theme_bw()