adegenet (version 1.0-2)

chooseCN: Function to choose a connection network

Description

The function chooseCN is a simple interface to build a connection network (CN) from xy coordinates. The user chooses from 6 kind of graphes. chooseCN calls functions from appropriate packages, handles non-unique coordinates and returns a connection network either with classe nb or listw.

Usage

chooseCN(xy, ask = TRUE, type = 1, result.type = "nb", d1 = NULL, 
    d2 = NULL, k = NULL, plot.nb = TRUE, edit.nb = FALSE)

Arguments

xy

an matrix or data.frame with two columns for x and y coordinates.

ask

a logical stating whether graph should be chosen interactively (TRUE,default) or not (FALSE).

type

an integer giving the type of graph (see details). Used if ask=FALSE

result.type

a character giving the class of the returned object. Either "nb" (default) or "listw", both from spdep package.

d1

the minimum distance between any two neighbours. Used if type=5.

d2

the maximum distance between any two neighbours. Used if type=5.

k

the number of neighbours per point. Used if type=6.

plot.nb

a logical stating whether the resulting graph should be plotted (TRUE, default) or not (FALSE).

edit.nb

a logical stating whether the resulting graph should be edited manually for corrections (TRUE) or not (FALSE, default).

Value

• Returns a connection network having the class nb or listw.

encoding

UTF-8

Details

There are 6 kinds of graphs proposed: Delaunay triangulation (type 1) Gabriel graph (type 2) Relative neighbours (type 3) Minimum spanning tree (type 4) Neighbourhood by distance (type 5) K nearests neighbours (type 6)

See Also

monmonier

Examples

data(nancycats)
if(require(spdep) & require(ade4)){

par(mfrow=c(2,2))
cn1 <- chooseCN(nancycats$xy,ask=FALSE,type=1)
cn2 <- chooseCN(nancycats$xy,ask=FALSE,type=2)
cn3 <- chooseCN(nancycats$xy,ask=FALSE,type=3)
cn4 <- chooseCN(nancycats$xy,ask=FALSE,type=4)
par(mfrow=c(1,1))
}