CODEWITHSUNDEEP
rggplot2legend
ccmullally
ccmullally

Reputation: 41

Changing legend in geom_density

I cannot understand why the legend is not changing given the following code. The same options do the trick with geom_histogram. Thanks in advance for any assistance.

data(mtcars)
ggplot(mtcars, aes(x = disp, color = as.factor(am))) +
  geom_density(aes(group = am)) +
  theme_classic() +
  guides(fill = guide_legend(reverse=TRUE)) +
  labs(x = "Displacement", y = "Density") +
  scale_fill_manual(name="",values=c("black","gray"),labels=c("Foreign","Domestic"))

Upvotes: 0

Views: 936

Answers (1)

Eutresis
Eutresis

Reputation: 26

You used color in your call of aes(). To modify the scale for this variable you need to use scale_color_manual and not scale_fill_manual.

It's tricky because geom_histogram does use fill, but geom_density uses color.

Working solution :

data(mtcars)
ggplot(mtcars, aes(x = disp, color = as.factor(am))) +
  geom_density(aes(group = am)) +
  theme_classic() +
  guides(fill = guide_legend(reverse=TRUE)) +
  labs(x = "Displacement", y = "Density") +
  scale_color_manual(name="",values=c("black","gray"),labels=c("Foreign","Domestic"))

Upvotes: 1

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