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Add Connected Line Segments to a Ternary Plot


ternary_lines(x, y, z, ...)

# S4 method for numeric,numeric,numeric
ternary_lines(x, y, z, type = "l", ...)

# S4 method for ANY,missing,missing
ternary_lines(x, type = "l", ...)


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, line type, lty, line width, lwd, color, col and for type = "b", pch. Also the line characteristics lend, ljoin and lmitre.


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


ternary_lines() 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 lines
ternary_plot(NULL, panel.first = ternary_grid())
ternary_lines(coda, col = "red", lwd = 2)