add_ternary_pc: Add principal component paths to a ternary plot

In coda.plot: Plots for Compositional Data

Add principal component paths to a ternary plot

Description

Add principal component paths to a ternary plot

Usage

add_ternary_pc(
  p,
  X,
  group = NULL,
  pcs = 1:2,
  basis = coda.base::ilr_basis(3),
  n = 600,
  eps = 0.001,
  ...
)

Arguments

p	A ggplot2 object created by ternary_plot().
X	A numeric matrix or data frame with exactly three columns.
group	Optional grouping variable of length nrow(X). If supplied, PCs are computed separately by group.
pcs	Integer vector indicating which principal components to draw.
basis	An ilr basis. Default is coda.base::ilr_basis(3).
n	Number of sampled points per PC path.
eps	Small positive threshold used to keep the path inside the simplex.
...	Further arguments passed to ggplot2::geom_path().

Value

A ggplot2 object.

coda.plot documentation built on April 12, 2026, 9:06 a.m.