Change the size and specify a colour to one data point in autoplot Prcomp

Question

I have plotted PC using autoplot and coloured it based on the species(~30 species). Of these I need to highlight only one selected species with different colour and size.

autoplot(sample_pca, data = sample, colour = "species")

Answer 1

library(ggfortify)
#> Loading required package: ggplot2
library(tidyverse)

samples <-
  iris |>
  mutate(is_setosa = (Species == "setosa") |> ifelse("setosa", "other"))

iris |>
  select(-Species) |>
  prcomp() |>
  autoplot(data = samples, colour = "is_setosa", size = "is_setosa")
#> Warning: Using size for a discrete variable is not advised.

^{Created on 2022-05-18 by the reprex package (v2.0.0)}