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. |

## See also

Other geometries:
`ternary_arrows()`

,
`ternary_crosshairs()`

,
`ternary_labels()`

,
`ternary_lines()`

,
`ternary_polygon()`

,
`ternary_segments()`

,
`ternary_text()`

## 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)
```