ggtern: geom_mean_ellipse – R documentation

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geom_mean_ellipse

Mean Ellipse

Description

Produce ellipses from a mean and a variance of ternary compositional data, based off the function included in the compositions package.

Usage

geom_mean_ellipse(mapping = NULL, data = NULL, stat = "MeanEllipse",
  position = "identity", ..., lineend = "butt", linejoin = "round",
  linemitre = 1, na.rm = FALSE, show.legend = NA,
  inherit.aes = TRUE)

stat_mean_ellipse(mapping = NULL, data = NULL, geom = "MeanEllipse",
  position = "identity", ..., steps = 72, r = 1, na.rm = FALSE,
  show.legend = NA, inherit.aes = TRUE)

Arguments

`mapping`	Set of aesthetic mappings created by `aes()` or `aes_()`. If specified and `inherit.aes = TRUE` (the default), it is combined with the default mapping at the top level of the plot. You must supply `mapping` if there is no plot mapping.
`data`	The data to be displayed in this layer. There are three options: If `NULL`, the default, the data is inherited from the plot data as specified in the call to `ggplot()`. A `data.frame`, or other object, will override the plot data. All objects will be fortified to produce a data frame. See `fortify()` for which variables will be created. A `function` will be called with a single argument, the plot data. The return value must be a `data.frame`, and will be used as the layer data. A `function` can be created from a `formula` (e.g. `~ head(.x, 10)`).
`stat`	Use to override the default connection between `geom_smooth()` and `stat_smooth()`.
`position`	Position adjustment, either as a string, or the result of a call to a position adjustment function.
`...`	Other arguments passed on to `layer()`. These are often aesthetics, used to set an aesthetic to a fixed value, like `colour = "red"` or `size = 3`. They may also be parameters to the paired geom/stat.
`lineend`	Line end style (round, butt, square).
`linejoin`	Line join style (round, mitre, bevel).
`linemitre`	Line mitre limit (number greater than 1).
`na.rm`	If `FALSE`, the default, missing values are removed with a warning. If `TRUE`, missing values are silently removed.
`show.legend`	logical. Should this layer be included in the legends? `NA`, the default, includes if any aesthetics are mapped. `FALSE` never includes, and `TRUE` always includes. It can also be a named logical vector to finely select the aesthetics to display.
`inherit.aes`	If `FALSE`, overrides the default aesthetics, rather than combining with them. This is most useful for helper functions that define both data and aesthetics and shouldn't inherit behaviour from the default plot specification, e.g. `borders()`.
`geom`	Use to override the default connection between `geom_smooth()` and `stat_smooth()`.
`steps`	the number of discretisation points to draw the ellipses
`r`	a scaling of the half-diameters

Aesthetics

geom_MeanEllipseunderstands the following aesthetics (required aesthetics are in bold):

x
y
alpha
colour
linetype
size

Computed variables

Same as stat_contour

Author(s)

Nicholas Hamilton & Ashton Drew

Examples

data(Feldspar)
  ggtern(data=Feldspar,aes(An,Ab,Or)) + 
    geom_point() + 
    geom_mean_ellipse()
data(Feldspar)
ggtern(data=Feldspar,aes(Ab,An,Or)) +
  theme_bw() + 
  stat_mean_ellipse(geom='polygon',steps=500,fill='red',color='black') +
  geom_point()

ggtern

An Extension to 'ggplot2', for the Creation of Ternary Diagrams

v3.3.0

GPL-2 | file LICENSE

Authors

Nicholas Hamilton [aut, cre]

Initial release

2020-04-9