plotrix (version 2.5-2)

triax.plot: Triangle plot

Description

Display a triangle plot with optional grid.

Usage

triax.plot(x=NULL,main="",at=seq(0.1,0.9,by=0.1),
 axis.labels=NULL,tick.labels=NULL,col.axis="black",cex.axis=1,cex.ticks=1,
 align.labels=TRUE,show.grid=FALSE,col.grid="gray",lty.grid=par("lty"),
 cc.axes=FALSE,show.legend=FALSE,label.points=FALSE,point.labels=NULL,
 col.symbols="black",pch=par("pch"),no.add=TRUE,...)

Arguments

x

Matrix where each row is three proportions or percentages that must sum to 1 or 100 respectively.

main

The title of the triangle plot. Defaults to nothing.

at

The tick positions on the three axes.

axis.labels

Labels for the three axes in the order left, right, bottom. Defaults to the column names.

tick.labels

The tick labels for the three axes as a list with three components l, r and b (left, right and bottom). Defaults to argument at (proportions).

col.axis

Color of the triangular axes, ticks and labels.

cex.axis

Character expansion for axis labels.

cex.ticks

Character expansion for the tick labels.

align.labels

Logical - whether to align axis and tick labels with the axes.

show.grid

Whether to display grid lines at the ticks.

col.grid

Color of the grid lines. Defaults to gray.

lty.grid

Type of line for the grid.

cc.axes

Whether axes and axis ticks should be clockwise or counterclockwise.

show.legend

Logical - whether to display a legend.

label.points

Logical - whether to call thigmophobe.labels to label the points.

point.labels

Optional labels for the points and/or legend.

col.symbols

Color of the symbols representing each value.

pch

Symbols to use in plotting values.

no.add

Whether to restore the previous plotting parameters (TRUE) or leave them, allowing more points to be added.

...

Additional arguments passed to points.

Value

• A list containing xypos (the x,y positions plotted) and oldpar (the plotting parameters at the time triax.plot was called).

Details

triax.plot displays a triangular plot area on which proportions or percentages are displayed. A grid or legend may also be displayed.

See Also

triax.points, triax.abline, thigmophobe.labels

Examples

data(soils)
 triax.plot(soils[1:10,],main="DEFAULT")
 triax.plot(soils[1:10,],main="PERCENTAGES (Counterclockwise axes)",
  tick.labels=list(l=seq(10,90,by=10),r=seq(10,90,by=10),b=seq(10,90,by=10)),
  pch=3,cc.axes=TRUE)
 triax.return<-triax.plot(soils[1:6,],main="GRID AND LEGEND",
  show.grid=TRUE,show.legend=TRUE,col.symbols=1:6,pch=4)
 # triax.plot changes a few parameters
 par(triax.return$oldpar)