At 3:55 Uhr 22.08.1996, Xah Lee wrote: >At 5:15 AM 96/8/16, Michael Friendly wrote: >>I'm looking for ideas on how to do trilinear plots, ie, plots >>on three axes which form an equilateral triangle (where the three coords are >>usually scaled so they sum to 1 for each observation)? >> >>Equivalently, this plot can be described as a plot of the locations of 3D >>points in the plane defined by x+y+z=1. > >Holy cow! This seems very interesting. Just for the curiosity of how >functions would appear as such plot, I might be interested to write a >package for it, with user specifying arbitrary number of axes and slant. > >Can anyone give me some information about such plot? Such as more detailed >description, its use?
This kind of plots are often used in geography, geochemistry to visualize data of different fields. Because my wife teaches geography, I have seen them before.
Examples: Part of Soil: sand, clay, Schluff (German word) Part of BIP for different countries: agriculture, industry, tertiar sector Part of people working in agriculture, industry, service for different sized communities
I have an article, written in German, how to use such plots. If I can help you let me know.