## ----include = FALSE----------------------------------------------------------
knitr::opts_chunk$set(collapse = TRUE, comment = "#>", fig.width = 7, fig.height = 5)

## -----------------------------------------------------------------------------
library(ggplot2)
library(dplyr)
library(ggcircular)

## -----------------------------------------------------------------------------
boundary_angles <- c(0.02, 0.05, 2 * pi - 0.05, 2 * pi - 0.02)

tibble(
  arithmetic_mean = mean(boundary_angles),
  circular_mean = mean_direction(boundary_angles),
  Rbar = mean_resultant_length(boundary_angles)
)

## -----------------------------------------------------------------------------
theta <- c(0, pi)

tibble(
  setting = c("directional", "axial"),
  mean = c(mean_direction(theta), mean_direction(theta, axial = TRUE)),
  Rbar = c(mean_resultant_length(theta), mean_resultant_length(theta, axial = TRUE))
)

## -----------------------------------------------------------------------------
set.seed(20260531)

known_mean <- pi / 3
simulated_angles <- normalize_angle(rnorm(400, mean = known_mean, sd = 0.25))

circular_summary(tibble(theta = simulated_angles), theta)
angular_distance(mean_direction(simulated_angles), known_mean)

## -----------------------------------------------------------------------------
ggplot(tibble(theta = simulated_angles), aes(x = theta)) +
  geom_rose(aes(y = after_stat(density)), bins = 24, alpha = 0.4) +
  geom_circular_density(linewidth = 1) +
  geom_mean_direction() +
  stat_vonmises_fit(linewidth = 1, linetype = 2) +
  scale_x_circular_degrees() +
  coord_circular() +
  theme_circular()

## -----------------------------------------------------------------------------
set.seed(20260531)

mixture_angles <- c(
  normalize_angle(rnorm(250, mean = pi / 4, sd = 0.20)),
  normalize_angle(rnorm(250, mean = 5 * pi / 4, sd = 0.25))
)

mixture_fit <- fit_vonmises_mixture(mixture_angles, k = 2, max_iter = 100)

tidy_circular(mixture_fit)
glance_circular(mixture_fit)

## -----------------------------------------------------------------------------
ggplot(tibble(theta = mixture_angles), aes(x = theta)) +
  geom_rose(aes(y = after_stat(density)), bins = 32, alpha = 0.35) +
  stat_vonmises_mixture(fit = mixture_fit, linewidth = 1) +
  scale_x_circular_degrees() +
  coord_circular() +
  theme_circular()

## -----------------------------------------------------------------------------
if (requireNamespace("circular", quietly = TRUE)) {
  tibble(
    ggcircular = mean_direction(simulated_angles),
    circular = as.numeric(circular::mean.circular(circular::circular(simulated_angles)))
  )
}

## ----eval = FALSE-------------------------------------------------------------
# devtools::test()
# devtools::check(document = FALSE, args = "--as-cran", build_args = "--no-manual")
# devtools::check(
#   document = FALSE,
#   args = c("--as-cran", "--run-donttest"),
#   build_args = "--no-manual"
# )
# tools::checkRdaFiles("data")