II tried this example in "R for Data Science": Chapter 22 (Chapter 22 - Graphics for communication):
df <- tibble(
x = runif(10),
y = runif(10)
ggplot(df, aes(x, y)) +
x = quote(sum(x[i]^2, i == 1, n)),
y = quote(alpha + beta + frac(delta, theta))
On the output, the sigma (summation) symbol is missing and replaced with a rectangle in the x-axis. What is the problem? I am using RStudio of 2013.03.0 build and R of version 4.2.2. I remembered it worked fine with an older version of R some months ago.
Thanks in anticipation.