piper.text: Display a string on a Piper diagram.

Description

Displays a character string on the Piper diagram.

piper.text(ca,mg,so4,cl,ions=data.frame(ca=ca,mg=mg,so4=so4,cl=cl),ptext,
  ppm=TRUE,cex=1,col=1,plot.sep=0.15,pos=4)

ca,mg,so4,cl

Concentrations of the ions.

ions

data frame containing the above values.

ptext

The character string.

ppm

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

cex

Expansion for the text.

col

Colors for the text.

plot.sep

The offsets.

pos

The position of the string relative to the data point.