I want to use the gghighlight package to label only the maximum y-axis value in a plot. Here's my code:
library(tidyverse)
#> Warning: package 'tidyverse' was built under R version 3.6.2
library(gghighlight)
#> Warning: package 'gghighlight' was built under R version 3.6.3
set.seed(47)
df <- tibble::tibble(
a = seq(0, 100, by = 5),
b = runif(21)
)
ggplot(df) +
aes(x = a, y = b) +
geom_point() +
geom_line() +
gghighlight(b == max(b), label_key = a) +
theme_minimal()
#> Error: Column `NULL` is unknown
Created on 2020-03-10 by the reprex package (v0.3.0)
Session info
devtools::session_info()
#> - Session info ---------------------------------------------------------------
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#> language (EN)
#> collate English_United States.1252
#> ctype English_United States.1252
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#> date 2020-03-10
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There's no problem if I run the example code in the gghighlight package, but I can't get it to work with my own data (or the iris dataset). Tips appreciated!