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The package contains routines to 1) project unitysummed triples to unitsquare doubles and vice versa, 2) make a grid of unitysummed triples paired to doubles, 3) evaluate a function over the grid and 4) make simple plots including ternary contour plots over a grid of values.
Package details 


Author  Tim Keitt <tkeitt@gmail.com> 
Maintainer  Tim Keitt <tkeitt@gmail.com> 
License  GPL2 
Version  1.1 
Package repository  View on CRAN 
Installation 
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