I’m attempting to use geom_text to create a label ‘Ankle Absorption W = -0.52 – 0.13 x Hop Height’. My understanding is that I need to use %*% within expression() to output the x sign. The numbers are stored in a data frame. I’m having difficulty getting expression() to read the data frame values – it simply prints the data frame name.
Here’s my current code:
ggplot(mtcars, aes(hp, wt)) +
geom_text( label = expression( 'Ankle Absorption W = '
mtcars$hp[1],' ', mtcars$hp[2] %*% 'Hop Height' ) )
The result for the mtcars$hp[1] portion was simply printing ‘mtcars$hp[1]’ rather than the stored values.
I’ve looked at other posts and tried using bquote() and paste() within expression() but it just prints ‘bquote’ and ‘paste’.
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4
Here’s an example using ggtext with a standard data set (with shorter variable names):
ggplot(mtcars, aes(hp, wt)) +
ggtext::geom_richtext(aes(label = glue::glue("{hp} × {wt}")),
fill = NA, label.color = NA)