R: Barycentric plots

trigrid {klaR} | R Documentation

## Barycentric plots

### Description

Function to add a grid to an existing (barycentric) plot.

### Usage

    trigrid(x = seq(0.1, 0.9, by = 0.1), y = NULL, z = NULL,
        lty = "dashed", col = "grey", ...)

### Arguments

`x` | Values along which to draw grid lines for first dimension (or all dimensions if `y` and `z` omitted). For NO grid lines in some dimensions just supply an `NA`.
`y` | Grid lines for second dimension.
`z` | Grid lines for third dimension.
`lty` | Line type (see `par`).
`col` | Line colour (see `par`).
`...` | Further graphical parameters passed to `trilines`.

### Details

Grid lines illustrate the set of points for which one of the dimensions is held constant; e.g. horizontal lines contain all points with a certain value y for the second dimension, connecting the two extreme points (0,y,1-y) and (1-y,y,0).

Grids may be designed more flexible than with `triplot`'s `grid` option.

### Author(s)

Christian Röver, roever@statistik.tu-dortmund.de

### See Also

`triplot`, `trilines`, `triframe`, `centerlines`

### Examples

    triplot(grid = FALSE)
    trigrid(c(1/3, 0.5)) # same grid for all 3 dimensions

    triplot(grid = c(1/3, 0.5))  # (same effect)

    triplot(grid = FALSE)
    # different grids for all dimensions:
    trigrid(x = 1/3, y = 0.5, z = seq(0.2, 0.8, by=0.2))

    triplot(grid = FALSE)
    # grid for third dimension only:
    trigrid(x = NA, y = NA, z = c(0.1, 0.2, 0.4, 0.8))

[Package klaR version 0.6-12 Index]