stat_summary and rlang lambda expressions

[dkahle]

While lambda expressions are allowed in stat_function() and a few other places, they aren't in stat_summary() type functions. Example below. Note that the args fun.y, fun.ymin, and fun.ymax are in the dev version fun, fun.min, and fun.max.

library("ggplot2")

df <- data.frame(
  x = c(1, 1, 2, 2, 3, 3),
  y = c(0, 2, 1, 3, 2, 4)
)

ggplot(df, aes(x, y)) +
  stat_summary(
    fun.y = mean,
    fun.ymin = function(y) mean(y) - 1,
    fun.ymax = function(y) mean(y) + 1
  )

ggplot(df, aes(x, y)) +
  stat_summary(
    fun.y = mean,
    fun.ymin = ~ mean(.x) - 1,
    fun.ymax = ~ mean(.x) + 1
  )
#> Warning: Computation failed in `stat_summary()`:
#> 'what' must be a function or character string

^{Created on 2019-10-14 by the reprex package (v0.3.0)}

[lock]

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