Confidence ellipse — ellipse • pliman

Produces a confidence ellipse that is an iso-contour of the Gaussian distribution, allowing to visualize a 2D confidence interval.

Usage

ellipse(
  x,
  conf = 0.95,
  np = 100,
  plot = TRUE,
  fill = "green",
  alpha = 0.3,
  random_fill = TRUE
)

x: A matrix, a data.frame or a list of perimeter coordinates, often produced with object_contour().
conf: The confidence level. Defaults to 0.95
np: Number of sampled points on the ellipse.
plot: Create a plot? Defaults to TRUE.
fill: The color to fill the ellipse. Defaults to "green".
alpha: The alpha value to define the opacity of ellipse. Defaults to 0.3
random_fill: Fill multiple ellipses with random colors? Defaults to TRUE.

A matrix with coordinates of points sampled on the ellipse.

Borrowed from Claude (2008), pp. 85

Claude, J. (2008) Morphometrics with R, Use R! series, Springer 316 pp.

if (interactive() && requireNamespace("EBImage")) {
library(pliman)
ellipse(contours)
}