BayesX: createxymap – R documentation

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createxymap

Create map objects for some points and a given distance

Description

Creates a map object from a list of coordinates by treating observations within a certain distance as neighbors. The resulting neighborhood structure is stored in a map object in graph format while a map in boundary format is created to enable visualisation.

Usage

createxymap(x, y, districts=NULL, p=2, max.dist)

Arguments

`x`	Vector of x-coordinates of underlying points
`y`	Vector of y-coordinates of underlying points
`districts`	Either `NULL` or a vector of names for labeling points. If `districts=NULL`, points are labelled by index.
`p`	Any p-norm with p>=1 can be chosen as the distance measure with the Euclidian distance (`p=2`) being the default. For `p=Inf`, the maximum of coordinates is used. Except for `p=Inf`, calculations can fail for huge `p`.
`max.dist`	Value which determines the neighborship. Points whose distance is smaller or equal than `max.dist` are considered as neighbors.

Value

List of two elements: map object in graph format and map object in boundary format.

Author(s)

Felix Heinzl, Thomas Kneib

Examples

x <- c(3,3,5,9.5,11,11)
y <- c(2,4,4,6,4.5,5)
xymap <- createxymap(x, y, districts=c("A","B","C","D","E","F"), max.dist=2)
xymap$gra
drawmap(map=xymap$bnd)

BayesX

R Utilities Accompanying the Software Package BayesX

v0.3-1

GPL-2 | GPL-3

Authors

Nikolaus Umlauf [aut, cre], Thomas Kneib [aut], Nadja Klein [aut], Felix Heinzl [ctb], Andreas Brezger [ctb], Daniel Sabanes Bove [ctb]

Initial release

2019-08-23