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Add Points to a Ternary Plot


ternary_points(x, y, z, ...)

# S4 method for numeric,numeric,numeric
ternary_points(x, y, z, type = "p", ...)

# S4 method for ANY,missing,missing
ternary_points(x, type = "p", ...)


x, y, z

A numeric vector giving the x, y and z ternary coordinates of a set of points. If y and z are missing, an attempt is made to interpret x in a suitable way (see grDevices::xyz.coords()).


Further graphical parameters (see graphics::par()) may also be supplied as arguments, particularly, plotting character, pch, character expansion, cex and color, col.


A character string indicating the type of plotting; actually any of the types as in graphics::plot.default().


ternary_points() is called it for its side-effects.


N. Frerebeau


## Compositional data
coda <- data.frame(
  X = c(20, 60, 20, 20),
  Y = c(20, 20, 60, 40),
  Z = c(60, 20, 20, 40)

## Add points
ternary_plot(NULL, panel.first = ternary_grid())
ternary_points(coda, col = "red", pch = 16)