CODEWITHSUNDEEP
rggplot2tidyverse
Ido
Ido

Reputation: 211

different titles for each element after using facet_wrap()

After setting ncol = 1 in the facet_wrap() function, I'm trying to use ggtitle() function inside the facet_wrap() function to set a different title for each graph created (there are only two of them).

ggplot(df, aes(x, y)) +
  geom_point() +
  facet_wrap(~ var, ncol = 1) +
  ggtitle(function(x) paste("Title for", df$title[df$var == x]))

I'm trying to use the value of the "title" column of the dataframe, where the value of the "var" column matches the value of the current plot's var.

But I get this error:

Error in as.character(x$label) : 
  cannot coerce type 'closure' to vector of type 'character'

How can I set different titles for each graph in ggplot2 using the facet_wrap() function with ncol=1?

Thanks, Ido

Upvotes: 1

Views: 69

Answers (1)

Cullen.Molitor
Cullen.Molitor

Reputation: 417

Here is something that might give you what you want. My comment above still stands, but this may be more what you are looking for.

library(ggplot2)
library(dplyr)

df <- mtcars %>% 
  mutate(strip_title = paste(cyl, "Cylinders"))

ggplot(df, aes(x = mpg, y = wt)) +
  geom_point() +
  facet_wrap(~strip_title, ncol = 1)

enter image description here

Upvotes: 1

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