coordinates_ternary: Ternary Coordinates

In isopleuros: Ternary Plots

Ternary Coordinates

Description

Computes ternary coordinates.

Usage

coordinates_ternary(x, y, z, ...)

## S4 method for signature 'numeric,numeric,numeric'
coordinates_ternary(
  x,
  y,
  z,
  center = FALSE,
  scale = FALSE,
  missing = getOption("isopleuros.missing")
)

## S4 method for signature 'ANY,missing,missing'
coordinates_ternary(
  x,
  xlab = NULL,
  ylab = NULL,
  zlab = NULL,
  center = FALSE,
  scale = FALSE,
  missing = getOption("isopleuros.missing")
)

Arguments

x, y, z	A numeric vector giving the x, y and z cartesian 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()).
...	Currently not used.
center	A logical scalar or a numeric vector giving the center.
scale	A logical scalar or a length-one numeric vector giving a scaling factor.
missing	A logical scalar: should missing values be replaced with zeros before the computation proceeds? If FALSE (the default), incomplete cases are removed.
xlab, ylab, zlab	A character string specifying the names for the x, y and z variables to be extracted.

Value

A list with the components:

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

Author(s)

N. Frerebeau

See Also

Other coordinates: coordinates_cartesian()

Examples

## Compositional data
coda <- data.frame(
  x = c(1, 0, 0, 1/3),
  y = c(0, 1, 0, 1/3),
  z = c(0, 0, 1, 1/3)
)

## Ternary coordinates
(tern <- coordinates_ternary(coda))

## Cartesian coordinates
(cart <- coordinates_cartesian(tern))

isopleuros documentation built on April 3, 2025, 7:40 p.m.