deldir: plot.divchain – R documentation

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plot.divchain

Plot a dividing chain.

Description

Plot the dividing chain of a Dirchlet tesselation. The tessellation must have been created from a set of points having associated categorical “weights”. The dividing chain consists of those edges of Dirichlet tiles which separate points having different values of the given weights.

Usage

## S3 method for class 'divchain'
plot(x, add = FALSE, ...)

Arguments

`x`	An object of class “divchain”. See `divchain.deldir()` for details.
`add`	Logical scalar. It `add=TRUE` the plot of the dividing chain is added to an existing plot.
`...`	Graphical parameters such as `main`, `xlab`, `col.main`, `col.lab`. In particular if `bty` is supplied (as a value other than `n`) a “box” will be drawn around the plot that is formed when `add=FALSE`. Also a non-standard graphical parameter `boxcol` may be supplied which will be taken to be the colour with which the box is drawn. If a `col` argument is supplied, this determines the colour for plotting the segments constituting the dividing chain.

Value

None.

Note

This function was created in response to a question asked on stackoverflow.com by a user named “Dan”.

Author(s)

Rolf Turner r.turner@auckland.ac.nz

Examples

set.seed(42)
   x   <- runif(50)
   y   <- runif(50)
   z   <- factor(kmeans(cbind(x,y),centers=4)$cluster)
   dc  <- divchain(x,y,z,rw=c(0,1,0,1))
   plot(dc,lwd=2,col="blue",bty="o")

deldir

Delaunay Triangulation and Dirichlet (Voronoi) Tessellation

v0.2-10

GPL (>= 2)

Authors

Rolf Turner

Initial release

2021-02-16