CODEWITHSUNDEEP
rggplot2
vtortola
vtortola

Reputation: 35905

Change title of geom_histogram's legend

I have a geom_histogram created with ggplot and I need to change the legend's title.

I find a lot of links about doing it with opts but it is deprecated now. The theme command allows to change esthetics, but not the title of the legend itself.

Which is the way of doing it?

Upvotes: 2

Views: 1917

Answers (2)

srvanderplas
srvanderplas

Reputation: 424

In general:
- scale_aes_continuous("Title") if the variable mapped to the chosen aesthetic (color, shape, linetype, fill, etc.) is continuous,
- scale_aes_discrete("Title") if the variable is discrete, or - scale_aes_manual("Title", values = c(...)) if you want to supply the values yourself.

See ?scale_color_continuous for more options

Since you didn't post a minimal example, here's mine:

data <- data.frame(
  x = c(rnorm(1000), rnorm(1000, mean = 6)),
  group = rep(c("a", "b"), each = 1000)
)
qplot(x = x, fill = group, data = data) + 
  scale_fill_discrete("New Title")

Histogram with fill aesthetic and new legend title

Upvotes: 0

hrbrmstr
hrbrmstr

Reputation: 78792

You haven't provided which aesthetic that's shown in the legend. I usually prefer setting the legend title manually in scale_… calls (when necessary), but you can use labs with the aesthetic title mapping. i.e.…

  • labs(color='title') to change the title of a legend/guide that maps the color aesthetic
  • labs(fill='title') to change the title of a legend/guide that maps the fill aesthetic
  • labs(size='title') to change the title of a legend/guide that maps the size aesthetic

(etc for all the other ones geom_histogram supports)

Upvotes: 1

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