triplot {broman} R Documentation

## Plot Holmans triangle

### Description

Plot Holmans triangle (an equilateral triangle used to depict trinomial distributions).

### Usage

triplot(
labels = c("(1,0,0)", "(0,1,0)", "(0,0,1)"),
col = "black",
lwd = 2,
bgcolor = "gray90",
gridlines = 0,
grid_col = "white",
grid_lty = 1,
grid_lwd = 1,
...
)


### Arguments

 labels Labels for the three corners (lower-right, top, lower-left). col Color of edges of triangle lwd Line width for edges of triangle bgcolor Background color for triangle gridlines Number of grid lines (if 0, no grid lines will be plotted) grid_col Color of grid lines grid_lty Line type of grid lines grid_lwd Line width of grid lines ... Passed to plot().

### Details

Plot of an equilateral triangle, in order to depict trinomial distributions. A trinomial distribution (that is, a trio of non-negative numbers that add to 1) is equated to a point in the triangle through the distances to the three sides. This makes use of the fact that for any point in an equilateral triangle, the sum of the distances to the three sides is constant. The triplot function creates an empty triangle for use with the related functions tripoints(), trilines(), triarrow().

### Value

The (x,y) coordinates of the points plotted, if any.

tripoints(), trilines(), triarrow(), tritext()

### Examples

triplot()
x <- cbind(c(0.9, 0.05, 0.05), c(0.8, 0.1, 0.1), c(0.1, 0.9, 0), c(0, 0.9, 0.1))
tripoints(x, lwd=2, col=c("black","blue","red","green"), pch=16)
trilines(x, lwd=2, col="orange")
y <- cbind(c(0.05, 0.05, 0.9), c(0.25, 0.25, 0.5))
triarrow(y, col="blue", lwd=2, len=0.1)



[Package broman version 0.80 Index]