tritrafo

0th

Percentile

Barycentric plots

Function to carry out the transformation into 2D space for triplot, trilines etc.

Keywords
dplot
Usage
tritrafo(x, y = NULL, z = NULL, check = TRUE, tolerance = 0.0001)
Arguments
x
Vector of fractions of first component OR 3-column matrix containing all three components (omitting y and z) OR 3-element vector (for all three components, omitting y and z).
y
(optional) vector of fractions of second component.
z
(optional) vector of fractions of third component.
check
if TRUE, it is checked whether x+y+z=1 and x,y,z>=0 for all cases.
tolerance
tolerance for above sum check.
Details

Projects the mixture given by x, y, and z with x, y, z between one and zero and x+y+z=1 into a two-dimensional space. For further details see triplot.

Value

  • A matrix with two columns corresponding to the two dimensions.

encoding

latin1

concept

  • Visualizing Classification Performance Measures
  • Barycentric plots

See Also

triplot, tripoints, trilines, trigrid

Aliases
  • tritrafo
Examples
tritrafo(0.1, 0.2, 0.7)
tritrafo(0.1, 0.2, 0.6) # warning 

triplot()
points(tritrafo(0.1, 0.2, 0.7), col="red")
tripoints(0.1, 0.2, 0.7, col="green")  # the same

tritrafo(c(0.1,0.2), c(0.3,0.4), c(0.6,0.4))
tritrafo(diag(3))

point <- c(0.25,0.6,0.15)
triplot(point, pch=16)
text(tritrafo(point), "(0.25, 0.60, 0.15)", adj=c(0.5,2)) # add a label
Documentation reproduced from package klaR, version 0.6-11, License: GPL-2

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