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

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.

bg.symbols

Background color for plotting symbols.

cc.axes

Clockwise or counterclockwise axes and ticks.

...

Additional arguments passed to points.

Author

Jim Lemon

Details

In order for triax.points to add points to an existing plot,
the argument no.add in the initial call to triax.plot
must be set to FALSE. Failing to do this will result in the
points being plotted in the wrong places. It is then up to the user
to call par as in the example below to restore plotting
parameters altered during the triangle plot.

triax.points displays each triplet of proportions or percentages
as a symbol on the triangle plot. Unless each triplet sums to 1
(or 100), they will not plot properly and triax.points will
complain appropriately.

data(soils)
triax.return<-triax.plot(soils[1:10,],
main="Adding points to a triangle plot",no.add=FALSE)
triax.points(soils[11:20,],col.symbols="green",pch=3)
par(triax.return$oldpar)