xf {ternvis}

x coordinate of a ternary forecast in barycentric coordinates

Description

This is a utility function to calculate the x-coordinate of a point in barycentric coordinates. It is unlikely that the user will want to use this function directly.

Usage

xf(p = cbind(1, 1, 1)/3, M = tsetup()$M32)

Arguments

p

An n-by-3 matrix of ternary forecasts.

M

A 2-by-3 matrix describing the transfromation for R^3 to R^2.

Value

An n-by-1 array of x-values for use in plotting.

Author(s)

Tim Jupp

References

Jupp TE, Lowe R, Stephenson DB, Coelho CAS (2012) On the visualization, verification and recalibration of ternary probabilistic forecasts, Philosophical Transactions of the Royal Society, volume 370, pages 1100-1120.

http://rsta.royalsocietypublishing.org/content/370/1962/1100.full

http://arxiv.org/abs/1103.1303

See Also

tsetup, yf

Examples

xf(p=cbind(.1,.2,.7))