Parse expression in guide primitive

[s-nicolas]

Hello,

I'm trying to use expression in guide primitive. I can see from key_range help page that name could be set as a list of expression but in unable to make it work.

Am I missing something ?

Here is an exemple based on guide composition help page :
`
standard <- ggplot(mpg, aes(displ, hwy)) +
geom_point() +
labs(
x = "Engine displacement (litres)",
y = "Highway Miles per Gallon"
) +
theme(axis.line = element_line())

range_key <- key_range_manual(
start = c(2, 4), end = c(5, 6),
name = list(2,expression("Second^{2}"))
)

standard + guides(x = compose_stack(
"axis_base",
primitive_bracket(range_key, "curvy")
))

`

Thanks a lot

[s-nicolas]

range_key <- key_range_manual( start = c(2, 4), end = c(5, 6), name = as.list(expression(2, Second^2)) ) does the trick