\donttest{
if (!requireNamespace("ggplot2", quietly = TRUE)) utils::install.packages(
  "ggplot2", repos = "https://cloud.r-project.org", quiet = TRUE
)

ggplot2::ggplot(bitcoin, ggplot2::aes(x = date, y = price)) +
  ggplot2::geom_line()

result <- suppressWarnings(
  fastcpd.garch(diff(log(bitcoin$price[200:500])), c(1, 1), beta = "BIC")
)
summary(result)
bitcoin$date[result@cp_set + 200]
plot(result)

cp_dates <- bitcoin[200 + result@cp_set + 1, "date"]
ggplot2::ggplot(
  data = data.frame(
    x = bitcoin$date[200:500], y = bitcoin$price[200:500]
  ),
  ggplot2::aes(x = x, y = y)
) +
  ggplot2::geom_line(color = "blue") +
  ggplot2::geom_vline(
    xintercept = cp_dates,
    color = "red",
    linetype = "dotted",
    linewidth = 0.5,
    alpha = 0.7
  ) +
  ggplot2::labs(
    x = "Year",
    y = "Bitcoin price in USD"
  ) +
  ggplot2::annotate(
    "text",
    x = cp_dates,
    y = 200,
    label = as.character(cp_dates),
    color = "blue"
  ) +
  ggplot2::theme_bw()
}