CODEWITHSUNDEEP
rggplot2
stackinator
stackinator

Reputation: 5819

Highlight Data Points Conditionally with Custom Colors

I want to conditionally format points to be red if they're less than 20 miles per gallon, and green if they're greater than 20 mpg. This works (but not the colors I want).

ggplot(mtcars, aes(wt, mpg)) + 
  geom_point(aes(color = cut(mpg, c(-Inf, 20, Inf))), size = 5)

As soon as I get fancy and try to select my own color scheme things break.

ggplot(mtcars, aes(wt, mpg)) + 
  geom_point(aes(color = cut(mpg, c(-Inf, 20, Inf))), size = 5) +
  scale_color_manual(name = "mpg",
                     values = c("(-Inf, 20]" = "red",
                                "(20, Inf]" = "green"),
                     labels = c("<= 20", "> 20"))

I found other examples on stackoverflow that follow the same template, but this doesn't work. I get this error and all points below 20 mpg are removed.

Warning message: Removed 18 rows containing missing values (geom_point).

Upvotes: 1

Views: 55

Answers (1)

troh
troh

Reputation: 1364

ggplot(mtcars, aes(wt, mpg)) + 
  geom_point(aes(color = cut(mpg, c(-Inf, 20, Inf))), size = 5) +
  scale_color_manual(name = "mpg",
                     values = c("red",
                                "green"),
                     breaks = c("(-Inf,20]",
                                "(20, Inf]"),
                     labels = c("<= 20", "> 20"))

Put the intervals in the "breaks" argument.

Upvotes: 3

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