tpalette: Draw a palette of the colours assigned to ternary forecasts

Description

Function to fill barycentric coordinates with a colour palette.

Usage

tpalette(q = cbind(1, 1, 1)/3, bars = TRUE, m = 0.7, 
         flip = FALSE, lmain = FALSE, theta0 = 0, 
	 dich = "none", cex = 1, nhist = 12)

Arguments

q: A 1-by-3 matrix containing a climatology.
bars: Logical. If "FALSE" a simple colour palette is produced. If "TRUE" barplots representing the forecasts are overlain.
m: Parameter controlling the rate at which colours saturate towards the corners of the triangle.
flip: Logical to transpose categories "B" and "A" in barycentric coordinates.
lmain: Logical. If "TRUE" text is overlaid.
theta0: Angle (degrees) through which to rotate colour palette around climatology q in barycentric coordinates.
dich: Option to render colours as they would appear to a dichromat. Default choice dich = "none" leaves colours unchanged. Choices dich = "deutan" and dich = "protan" show colours as they would appear to those with deutanopia or protanopia (see dichromat).
cex: Factor for expanding the size of the dots when bars is "FALSE".
nhist: Number of barplots along each side of the triangle when bars is "TRUE".

Author

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.

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

https://arxiv.org/abs/1103.1303/

Examples

Run this code

dev.new()
tpalette(bars=FALSE) # standard palette

dev.new()
tpalette(bars=TRUE) # palette with histograms overlaid