AddToHoldridge {Ternary}R Documentation

Add elements to ternary or Holdridge plot

Description

Plot shapes onto a ternary diagram created with TernaryPlot(), or a Holdridge plot created with HoldridgePlot().

Usage

AddToHoldridge(PlottingFunction, pet, prec, ...)

HoldridgeArrows(fromCoordinates, toCoordinates = fromCoordinates, ...)

HoldridgeLines(pet, prec, ...)

HoldridgePoints(pet, prec, ...)

HoldridgePolygon(pet, prec, ...)

HoldridgeText(pet, prec, ...)

AddToTernary(PlottingFunction, coordinates, ...)

TernarySegments(fromCoordinates, toCoordinates = fromCoordinates, ...)

TernaryArrows(fromCoordinates, toCoordinates = fromCoordinates, ...)

TernaryLines(coordinates, ...)

TernaryPoints(coordinates, ...)

TernaryPolygon(coordinates, ...)

TernaryText(coordinates, ...)

JoinTheDots(coordinates, ...)

Arguments

PlottingFunction

Function to add data to a plot; perhaps one of points, lines or text.

pet, prec

Numeric vectors giving potential evapotranspiration ratio and annual precipitation (in mm).

...

Additional parameters to pass to PlottingFunction(). If using TernaryText(), this will likely include the parameter labels, to specify the text to plot. Other useful graphical parameters include srt to rotate text.

fromCoordinates, toCoordinates

For TernaryArrows(), coordinates at which arrows should begin and end; cf. x0, y0, x1 and y1 in arrows. Recycled as necessary.

coordinates

A list, matrix, data.frame or vector in which each element (or row) specifies the three coordinates of a point in ternary space.

Functions

Author(s)

Martin R. Smith (martin.smith@durham.ac.uk)

See Also

Other Holdridge plotting functions: HoldridgeHypsometricCol(), HoldridgePlot(), holdridgeClasses, holdridge

Examples

coords <- list(
  A = c(1, 0, 2),
  B = c(1, 1, 1),
  C = c(1.5, 1.5, 0),
  D = c(0.5, 1.5, 1)
)
TernaryPlot()
AddToTernary(lines, coords, col = "darkgreen", lty = "dotted", lwd = 3)
TernaryLines(coords, col = "darkgreen")
TernaryArrows(coords[1], coords[2:4], col = "orange", length = 0.2, lwd = 1)
TernaryText(coords, cex = 0.8, col = "red", font = 2)
TernaryPoints(coords, pch = 1, cex = 2, col = "blue")
AddToTernary(points, coords, pch = 1, cex = 3)

# An equivalent syntax applies to Holdridge plots:
HoldridgePlot()
pet <- c(0.8, 2, 0.42)
prec <- c(250, 400, 1337)
HoldridgeText(pet, prec, c("A", "B", "C"))
AddToHoldridge(points, pet, prec, cex = 3)

[Package Ternary version 2.1.3 Index]