Project unity-summed triples (a, b, c) to unit-square doubles (x, y)

Description

Given a matrix of ternary values, this function will compute their x, y coordinates.

Usage

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abc2xy(abc)

Arguments

abc

A 3-column matrix containing unity-summed triples

Details

The x, y coordinates are scaled such that the altitude of the equilateral triangle defining the ternary space is equal to one.

Value

A matrix of x, y values, one per row

Author(s)

Timothy H. Keitt <tkeitt@gmail.com>

References

http://dx.doi.org/10.1016/j.ecolmodel.2012.05.020

See Also

xy2abc

Examples

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# See demo(trifield)
## Not run: 
grid.size = 128
par(mar = rep(2, 4), oma = rep(0, 4))
tg = ternary.grid(grid.size)
f = function(x)
        sin(2 * pi * x[1]) +
        sin(3 * pi * x[2]) +
        sin(4 * pi * x[3])
z = ternary.apply(tg, f)
tf = ternary.field(tg, z)
plot(tf)
ternary.legend()

## End(Not run)