add: label_tex as an extention of ggplot2::label_parsed

[atusy]

By this PR, math in facets' stripe becomes quite easy.

library(dplyr)
library(ggplot2)
library(ggforce)
d <- data.frame(
    facet = "$f(x) = \\frac{1}{\\sqrt{2\\pi\\sigma^2}}exp\\left(-\\frac{(x-\\mu)^2}{2\\sigma^2}\\right)$",
    x = seq(-3, 3, 0.1)
  ) %>%
  mutate(y = dnorm(x))
ggplot(d, aes(x, y)) +
  geom_line() +
  facet_wrap(~ facet, labeller = label_tex)

[thomasp85]

I would love to add this but would prefer if latex2exp was put in Suggest instead of Import

[atusy]

I'm glad you like this. I force pushed with following changes

• moved latex2exp to suggests
• rebased to current main branch
• coordinated with latest API of ggplot2 and latex2exp

[thomasp85]

Fantastic - just a few changes needed

[atusy]

Thank you for the review!! Now the problems should be fixed.

[atusy]

Oops, I need to avoid string becoming factors by as.data.frame .

[thomasp85]

Once the last merge conflicts are fixed I can merge

[thomasp85]

thanks!!

[atusy]

Thank you, too!!!