plotrix (version 2.5-2)

piper.points: Display the points on a Piper diagram.

Description

Displays the points for the anions and cations in the Piper diagram.

Usage

piper.points(ca,mg,so4,cl,ions=data.frame(ca=ca,mg=mg,so4=so4,cl=cl),sites,
  ppm=TRUE,chull=FALSE,pch=3,main="",cex.pch=1,col=NA,pch.lwd=0.7,plot.sep=0.15)

Arguments

ca,mg,so4,cl

Concentrations of the ions.

ions

data frame containing the above values.

sites

indices for ions.

ppm

Whether the concentrations are in milligrams/liter (parts per million) or milliequivalents.

chull

Whether to display points or polygons for the concentrations.

pch

Symbol to use in plotting points.

main

title for the diagram

cex.pch

Expansion for the points.

col

Colors for the points/polygons.

pch.lwd

Line widths.

plot.sep

The offsets for the ions.

Value

• A list containing the coordinates of the points and optionally information about the indices and colors.

Details

piper.points displays the points/polygons in the Piper diagram.

See Also

piper.diagram