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get.triprop allows the user to enter triplets of proportions or percentages of three components such as sand, silt and clay in soils.

get.triprop(use.percentages=FALSE,cnames=c("1st","2nd","3rd"))

A matrix of the components of one or more observations.

Logical - whether to treat the entries as percentages and scale to proportions.

column names for the resulting three column matrix.

Jim Lemon

The three proportions of each row must sum to 100 or 1 within 1% or the function will warn the operator.

triax.plot, soil.texture

if(dev.interactive()) { # get some proportions newsp<-get.triprop() # show the triangle triax.frame(main="Test triax.plot") # now plot the observations triax.points(newsp) }

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