Ternary Interpolation

Description

This is the heavily requested geometry for interpolating between ternary values, results being rendered using contours on a ternary mesh.

Usage

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
geom_interpolate_tern(mapping = NULL, data = NULL,
  stat = "InterpolateTern", position = "identity", ..., method = "auto",
  formula = value ~ poly(x, y, degree = 1), lineend = "butt",
  linejoin = "round", linemitre = 1, na.rm = FALSE, show.legend = NA,
  inherit.aes = TRUE)

stat_interpolate_tern(mapping = NULL, data = NULL,
  geom = "interpolate_tern", position = "identity", ..., method = "auto",
  na.rm = FALSE, show.legend = NA, inherit.aes = TRUE, n = 80,
  formula = value ~ poly(x, y, degree = 1), base = "ilr")

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.

stat

The statistical transformation to use on the data for this layer, as a string.

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 color = "red" or size = 3. They may also be parameters to the paired geom/stat.

method

smoothing method (function) to use, eg. "lm", "glm", "gam", "loess", "rlm".

For method = "auto" the smoothing method is chosen based on the size of the largest group (across all panels). loess is used for than 1,000 observations; otherwise gam is used with formula = y ~ s(x, bs = "cs"). Somewhat anecdotally, loess gives a better appearance, but is O(n^2) in memory, so does not work for larger datasets.

formula

formula to use in smoothing function, eg. y ~ x, y ~ poly(x, 2), y ~ log(x)

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.

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.

n

number of grid points in each direction

base

the base transformation of the data, options include 'identity' (ie direct on the cartesian space), or 'ilr' which means to use the isometric log ratio transformation.

Aesthetics

\Sexpr[results=rd,stage=build]{ggtern:::rd_aesthetics("geom", "InterpolateTern")}

Author(s)

Nicholas Hamilton

Examples

1
2
3
4
5
6
7
8
data(Feldspar)
ggtern(Feldspar,aes(Ab,An,Or,value=T.C)) + 
stat_interpolate_tern(geom="polygon",
                     formula=value~x+y,
                     method=lm,n=100,
                     breaks=seq(0,1000,by=100),
                     aes(fill=..level..),expand=1) +
                     geom_point()

Want to suggest features or report bugs for rdrr.io? Use the GitHub issue tracker.