Add Points to a Ternary Plot

## Usage

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

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

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

## Arguments

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.

center

A logical scalar: should the data be centered?

scale

A logical scalar: should the data be scaled?

type

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

## Value

ternary_points() is called it for its side-effects. Invisibly returns a list with the components:

 x A numeric vector of x values. y A numeric vector of y values. z A numeric vector of z values. center A numeric vector giving the center. scale A numeric vector giving the scale factor.

graphics::points()

Other geometries: ternary_arrows(), ternary_crosshairs(), ternary_labels(), ternary_lines(), ternary_polygon(), ternary_segments(), ternary_text()

N. Frerebeau

## Examples

## Add points
## Data from Aitchison 1986
ternary_plot(NULL, panel.first = ternary_grid())
ternary_points(lava, col = "red", pch = 16)

## Center and scale
ternary_plot(NULL, axes = FALSE, frame.plot = TRUE)
ternary_points(lava, col = "red", pch = 16)
ternary_points(lava, center = TRUE, col = "blue", pch = 16)
ternary_points(lava, center = TRUE, scale = TRUE, col = "green", pch = 16)