Cartesian coordinates to ternary point

Source: R/Coordinates.R

Convert cartesian (x, y) coordinates to a point in ternary space.

XYToTernary(
  x,
  y,
  direction = getOption("ternDirection", 1L),
  region = getOption("ternRegion", ternRegionDefault)
)

XYToHoldridge(x, y)

XYToPetPrec(x, y)

Arguments

x, y

Numeric values giving the x and y coordinates of a point or points.

direction

(optional) Integer specifying the direction that the current ternary plot should point: 1, up; 2, right; 3, down; 4, left.

region

(optional) Named list of length two specifying the the minimum and maximum values of each ternary axis to be drawn (e.g. list(min = c(40, 0, 0), max = c(100, 60, 60)); or a set of coordinates in a format accepted by TernaryPoints(). The plotted region will correspond to the smallest equilateral triangle that encompasses the specified ranges or coordinates.

Value

XYToTernary() Returns the ternary point(s) corresponding to the specified x and y coordinates, where a + b + c = 1.

See also

Other coordinate translation functions: ReflectedEquivalents(), TernaryCoords(), TriangleCentres()

Examples

XYToTernary(c(0.1, 0.2), 0.5)
#>        [,1]       [,2]
#> a 0.5773503 0.57735027
#> b 0.3113249 0.41132487
#> c 0.1113249 0.01132487